Since it's being talked about in the EU Questions thread, I figured I'd start a thread about it.
Labyrinth of Evil is the lead-in book to Revenge of the Sith, this is one of my all time favorite Star Wars books.
This is one of my favorites too. The last chapter perfectly illustrates the relationship between Anakin and Obi-Wan. This is a must read for all Star Wars fans.
This book ROCKS! It's definitely one of my all time favorites. I love the whole part where Mace and Shaak Ti almost finding Sidious in his Lair. You're almost holding your breath because at any moment the Jedi could have figured the whole thing out (even though you know they won't).
Labyrinth of Evil was great, a perfect lead in to ROTS. I like how it can cover stuff that doesn't need to be covered in the movies.