Although I'm stuck with the title "newbie", I do know a bit about surround sound and which movies rock to enjoy this. Here is a list of my favorite (and best) surround movies that really show off a good system:
Jurassic Park (DTS)
Indiana Jones DVDs (did any awesome pan job with the surrounds)
Master and Commander (hated the movie, loved the surround)
Lord of the Rings Extended (DTS-ES)
Gladiator (DTS)
Neon Genesis Evangelion Platinum Series (coming to US fans this summer, I hear it is awesome!)
The Eagle's Hell Freezes Over (wow...wow)
Saving Private Ryan (DTS)
Finding Nemo

If you have any that you'd like to pass onto others, post'em here!