Well i think that it was missing, on this DRM free forum ( :) ) a post where whe insert the games that have DRM and what type of DRM they have. What you think creating a list of those games.
Ok, i'll start.
UFO: Aftershock - Starforce.

The Witcher - TAGES (but it's actually very unintrusive, I was able to install and play my game w/o CD key).

Games with SecuROM (bolded ones have activation limits/require activation on-line):
Reclaim Your Game List
StarForce Games List.

Very interesting article about piracy and DRM:
http://www.tweakguides.com/Piracy_1.html
This bit is about DRM. Well worth a read:
http://www.tweakguides.com/Piracy_8.html
And here are sections on Starforce, Steam and Securom:
http://www.tweakguides.com/Piracy_9.html
Quote from the conclusion of the Starforce-part:
Shamefully, I have to confess that at the time, I too believed all the StarForce stories a little too easily. I never experienced, nor directly saw on any PC under my control, or in my role as a guide-writer or forum troubleshooter, any evidence that StarForce causes serious problems. However trusting that so many people couldn't all be wrong, I used to write warnings in my guides that StarForce was harmful and should be avoided. It was only recently upon taking the time to sit down and research this topic properly, that I've considered the evidence of the causality between StarForce's ability to actually prevent piracy and the sudden ramping up of the hate campaign against StarForce. Again, this is not to say StarForce doesn't cause any problems, simply that most of the wild accusations being thrown around about it were almost certainly untrue.

That's a very good article with one caveat: despite what he says, I don't think he really did that much research into the effects of StarForce or SecuROM. I also disagree with some of his conclusions. But overall, it's a very well done article.

Those are very interesting, but let's try to keep on topic here, please, or we risk to end with a confusing thread.

TAGES is not uninstrusive at all. It installs hidden drivers without telling you and progressively disrupts your gameplay without any warnings if you don't activate the game properly and have the original media in the drive while playing. In fact, with the Witcher, it actually made it impossible to beat the game since the gameplay disruptions resulted in the disappearance of certain NPCs. They did fix it with an update to the TAGES system however.
As for other games with copy protection (just by going through my library):
Darkstar One - TAGES
Scrapland - StarForce
Freedom Force - SafeDisk
Freedom Force vs. The Third Reich - StarForce
KotOR - SecuROM (V5)
KotOR 2 - SecuROM (V5 initially, V7 after update)
Vampire Bloodlines - SafeDisk
Call of Duty and United Offensive - SafeDisk
Freelancer - SafeDisk
Tron 2.0 - SecuROM (V4)
Grand Theft Auto 3 - SafeDisk
Grand Theft Auto: Vice City - SecuROM (V4)
Advent Rising - SecuROM (V7)
TOCA Race Driver 3 - StarForce
Hitman 2 - SecuROM (V2)
Hitman Contracts - SecuROM (V5)
The rest of my games, I'm not as sure about what they have for DRM. If I can figure it out, I'll add them.

While he's quite even tempered and very logical, it doesn't mean he's the ultimate authority nor does it mean he's correct 100% of the time. He is human after all, even the best of us get our views tempered by some form of bias. You can put hours of research into anything, but if the majority of your information is one sided... well.. just how accurate can it be?
A nice example of having some bias is the Vista article. I thought it was a great article. But my views are definitely coloured by my experiences with the OS and that I actually like Microsoft products (and here come the -1s). But after reading it I still couldn't help but feel there was a touch of fanboyism throughout. Some of it was due to his protestations about how unbiased he is. As they say, "Methinks he doth protest too much". I'd really like to believe he was being even and fair, but at the same time, I have trouble believing it. Maybe I'm jaded in my old age.

"More popular/desirable games are pirated more heavily than less popular games. The entire top 10 pirated games list doesn't contain any truly unpopular games, indeed some of the most popular good quality games of 2007/08 appear on the list. Similarly when searching torrents, I found more popular games have far more individual torrent listings than less popular games. This clearly contradicts the claim that 'good games get pirated less' - we see more evidence of the fallacy of this claim throughout this article."
Thats an insane statement though. Popular is not necessarily synonymous with good, and good is essentially a subjective term, whereas popular is not.
Also he later states Assassins Creed and Crysis have no intrusive DRM whatsoever. Assassins Creed has been reported on otherwise, and Crysis has SecuROM. :P
(sorry to stray, ghost, hard to resist...)

Splinter Cell: Chaos Theory = Starforce
Neverwinter Nights 2 = SecuROM/CD Serial Key
Uplink has the old "what is the word/number on page 1 ccolum 4" bit
Sacred 2 has this supposedly new DRM that lets you turn any unauthorized installations into 24 hour demos that supposedly let you explore as much content as you can within 24 hours.
Fallout 3 = SecuROM
Oblivion = SecuROM
That's all I can think of at the top of my head...

It's not a bad article at all, but one of his arguments was that SecuROM and the like are necessary to prevent Day 0 piracy...to let the game establish a market footprint for itself. Okay, if THAT'S the reason for it, then why not remove it retroactively a couple of months after the game has been released to the marketplace?

Semantics about "good vs popular" are completely irrelevant. The point was simple (and accurate): there is a direct correlation between popularity and piracy. The point was to refute the claim that "good games get pirated less."
Assassin's Creed uses SafeDisc with no online activation. Who knows what those pings were for, but they weren't for SafeDisc. Google all over the place for "SafeDisc online activation" or other obvious combos.
Crysis (not Warhead) has SecuROM, but not online activation.
As for why they don't remove their protections- I can think of some who do. Neverwinter Nights, for isntance, removed the SecuROM disk check after 1.6 or something. As for why all companies don't do it, I'm not sure. It could probably be chalked up to 1) there's no point, because that particular practice isn't complained about enough, 2) laziness, 3) too busy focusing on new games in development.
Even the dreaded even guys at Starforce state that they recommend to their clients that they remove CD checks in future patches. It's completely up to the devs on a game by game basis, though, so no matter what they say it means nothing unless we whine to game makers enough.

Of course there's a direct correlation; the claim that "good games get pirated less" was always a straw man. Good games tend to sell better than bad games, and popular games are popular in multiple contexts. There is no zero sum.

Normally I'd write something detailed in my agreement with you, but I'll just say this: Stupid. Stupid stupid stupid. He tries to be objective but I think he pretty clearly biased.