I came across this question in the blurb forum, which i had to perform myself for one of the albums i was working on.
forums.blurb.com/forums/4/topics/3868
In general How can i update the photos in booksmart to use the latest updated photos that i have edited in photoshop/gimp?
You can delete the files in C:\Documents and Settings\{USER_NAME}\My Documents\BookSmartData\{BOOK_NAME}library.
In booksmart, [...]

Wanna run booksmart on a linux box?
Check out
clecuret.blogspot.com/2008/04/booksmart-sur-linux-cest-de-nouveau.html
A patch has been made until blurb decided to support this officially.
I’m also in the midst of creating an editor for the template for the booksmart. Anyone interested in using it?