Here is a very nice book tracking application for Mac OS X:
http://books.aetherial.net/wordpress/
It is free and open software, runs VERY fast, and it is free (-:
It has the ability to auto-import books based on Amazon.com data, and you can attach files to the book entries.
The two features it is missing:
-Support for Sony Reader and Connect eBooks
-Auto-generation of RSS Feed PDF's (-:
Anyone want to get cracking? I would, but I am a Java man.