Hey I just want to point everyone to 2 pieces of software which record your game-playing time. It's useful if you want to see how much of a bargain you've scored (if you spent $10 on a game and end up playing it for 100 hours, then you clearly spent your money well :D)
One is called xfire; I'm sure most of you have heard of it. Sadly it only records games it supports. The list of supported games is pretty massive but it doesn't support some obscure games like Evolva. Check it out here
Next is a program called Wakoopa. It records ALL software usage time, so be careful with this one if you... want to keep things private :p It also recently records website browsing (but this can easily be disabled). Anywho, it's great for recording dosbox gametime as well as obscure titles/freeware/etc. Check it out here.
If interested, check out my profiles for both
xfire
Wakoopa (note dosbox times are stonekeep only :p)

Wow, thanks for this post. I have been loving Steam's tracking, and never bothered to go find an all-encompassing tool for such things. It's probably going to scare me into exercising, but I guess I can monitor my exercise with a music program... ah, the possibilities!

Well hmm, thanks but I'm already used to use my watch :P
About Wakoopa I already see coming the people saying this kind of program is a spyware... ah, interwebz :)

Wakoopa? OMG that kind of app is bound to be spyware!

That's shitware....
Do you want to record your games? Use Fraps, period.

Excuse me wtf r u doin - We're talking about recording game TIME. Read the posts before saying -I quote- shit.

camstudio freakin' rocks.

but I am one?

Wakoopa sounds vaguely interesting, so I'll give it a spin, thanks for the heads up :)