I would just like to comment on something before anyone else brings it up (for what little that will do)
The plan here
http://savygamer.co.uk/2010/02/19/drm-assassination-lets-send-a-message-to-ubisoft/ and all plans similar to it are NOT the answer.
To summarize: That site (and probably many others) are suggesting buying the game, returning it, and complaining about DRM.
Why this is a REALLY bad idea:
First, this requires even more willpower than a boycott. It is one thing to expect someone to not buy something, it is another to expect them to buy it and return it.
Second, it will hurt the retailer more than Ubi. Yes, Ubi may or may not lose some cash on this (depends on how the retail process works at that level) and yes, the store will be made aware. But think about it this way: PC gaming is already "dying". If you get mass returns, are you going to refuse to stock games with DRM, or just refuse to stock PC games period?
And also, most retailers just put the same blurb that they get in the press release on the website. So if they aren't focused on PC gaming (and they aren't...), they might not even follow all the DRM fiascos and the like.
Third, the way this is organized is as an attack against Ubi (and poor Tesco). Not a boycott. You know how protesters tend to get their point across if they are semi-orderly and organized, as opposed to raving lunatics with 2x4s? Same thing here. We do NOT want to become the enemy. Because, if PC gamers aren't "the enemy" before, they will be after something like this.
So please, for the love of all that is holy, tell everyone you know to NOT do what SavyGamer is suggesting. If you are going to boycott the game, boycott it. If you want your voice to be heard, contact Ubi. But do NOT attack them. This is even worse than "Der, I'll just pirate it"