I read the six-book Jedi Prince series when I was a kid (The one that began with "The Glove of Darth Vader"). I remember enjoying them when I was young, but I hear they're really bad, so I haven't really had any desire to hunt down my copies.
Another stinker I read was "Darth Maul: Shadow Hunter". Yeah....don't bother with that one.
"Shadows of the Empire" was decent, but the only reason I read it was because I was really into the N64 game back in the day. I still haven't gotten around to reading the Zahn books yet.
I own Splinter of the Mind's Eye, but have yet to read it. Since this week is my spring break, I may get around to it.