I got into Zappa around 3 years ago from hearing Lumpy Gravy.

I enjoy most all of his stuff with the Mothers of Invention, although I am still aquiring a taste for some of the solo albums. If you really dig Zappa then you should definitely check out Captain Beefheart. They were friends who I believe went to the same highschool, his music is similar to Zappa's.

Breukelen Advocaat is right about the anti-drug views though... I always enjoy the irony of listening to Zappa when under the influence of whatever I may be.