By now if you use any other newsfeed to supplement your need for biometric news that just isn't met here, you probably already heard about the Gelatin spoofing- Swede.
Well, here's her thesis on the matter. It's pages and pages of fun, and although I haven't gotten to the juicy stuff yet, I'm on my way. The good stuff starts at about page 40 or so.
Liveness Detection in Fingerprint Recognition Systems