I am a big fan of the expanded universe and have a number of favourite links in this area:

Jedinet's Books and Comics Page

Jedinet's Timeline - a comprehensive listing of Books and Comics on a single page, with hyperlinks to synopses of each

Nathan Butler's Star Wras Timeline Gold - an amazingly detailed listing of just about everything in the Star Wars universe

Rob Muliins' EU Chronology - with listings of most Books, Comics, Short stories, Television and Movies broken down into chapters in chronological order

eddie's Star Wars Timeline - currently incomplete but combining Nathan's and Rob's formats with each event set out in chronological order

TFN's unofficial star wars encyclopaedia - which contains several errors, but is nonetheless very useful

and then there are the author sites:

Aaron Allston's official site

Karen Traviss' blog