DRM is a horrible, horrible thing, and even though it's been pointed out again and again, companies still use it (are the DRM peddlers FUDsters?).
Penny Arcade has a nice three-parter on DRM, although part three is best (part one, part two). Of course there are the accompanying comics (one, two, three).
You should of course read Cory Doctorow's Microsoft talk about DRM (or maybe watch the video).
The Machinist at Salon has a nice write-up of the dust-up over the Spore DRM. Omg it installed SecuROM on my Mac?!?! Not acceptable! Well I guess I have to find out how to remove it now...
Don't forget the Sony rootkit fiasco either. Wikipedia's external links for the article may be better, there is one for BoingBoing and one for Groklaw.
Oh and, a late add, XKCD's recent take on it. Pretty accurate and concise.
