Curtain Call: The Hits - is very good
Recovery - was pretty solid imo, although a few were a bit dodge.
Encore - is one of my favourites
The Eminem Show - Also has some great songs on it
If you want to know the whole discography just google it!
Gives a full run down of his 8 studio albums and the "other albums" .... There are also loads of mixtapes out there which are really not worth the money, so be careful what you're buying...