Rif's Blog notes an interesting post on the Dragon Door forums regarding training the kettlebell snatch for the Secret Service Snatch Test. For the uninitiated, this involves 10 minutes of snatching with a 24kg kettlebell (and the occasional re-appearance of lunch).
For another take on this punishing challenge, check out Jared Savik's article; again on Dragon Door. Sounds like fun, in a twisted sort of way.
Further reading
If you're just looking for more info on performing the Snatch itself, a great place to start is Troy Anderson's article The Perfect Snatch.