If, like me, you're not really into EU stuff that doesn't feature the classic OT characters (and it sounds like that's the case), you might try the Marvel comic books, which continued with their own story after the adaptation of the first movie was over. Okay, so they're not books as such, but they do feature the OT gang in new adventures. Each one is short, so it's not a big time investment, and you get to look at cool pictures into the bargain.