Obsolete: Links are dead, except for the source code which is very dated.
These books contain the top questions from a selection of the top tags on Stack Overflow. The top questions include those with a score of 10 or greater (except in the case of a high volume tag like c#).
The content of the ebooks is licensed under the same Creative Commons license as Stack Overflow itself.
The ebooks are in Mobipocket format. They have been tested with the Kindle and are likely to work on other devices. They can be converted to other ebook formats with a tool such as Calibre.
These books were created by Greg Hewgill.
Source is on Github. It's sort of a hodgepodge of Python, Java, and XSLT (applying the best tool for each job).