An amazing statistic I hadn't heard before was that a survey by Big Champagne found that DRM-protected files exclusively released through iTunes typically appear in unprotected form on P2P networks 180 seconds later.

Update: This is actually very old news; here is a reference from 2004 which cites Kazaa and 120 seconds. here is a Cory Doctorow talk from 2005 which repeats the 3 minute figure without specifying a network.

DRM-a-go-go