I just finished reading Death Star by Michael Reaves & Steve Perry. I really enjoyed it as it gave a more day to day aspect of the people living on the Death Star and it also made me realise, more than I had before, that not all Imperials are bad.
If you're after a good read and don't mind it being focussed on new characters then this is your book. As you can image Darth Vader, Grand Moff Tarkin, Princess Leia and Obi Wan Kenobi do also make various appearances. Darth Vader's insight is pretty cool. (Sorry no Fett).
Anyway I've said my bit, here's the link for the book: http://www.randomhouse.com/catalog/display.pperl?isbn=9780345477422