I have been wanting to get back into some of the EU books. I enjoyed the Zahn trilogy as most others here have said. For EU those are probably the best recommended and best reads around. The first Han Solo trilogy by Brian Daly is good too. Someone else mentioned some of the early comics...I would second that. And if you are one to read comics, the Dark Empire series that was published by Dark Horse Comics in the early 90s was really good too, IMO. They released it in graphic novel form as well, at one time, so you don't have to hunt all the issues down. Dark Empire takes place right after ROTJ too.

I want to try Rogue Squadron. Sounds like it's pretty good.

Star Wars EU is so all over the map it can be tricky to find the good stuff, it seems.