h4k.com

This web site covers the latest malware on the Internet. It is updated frequently and even has videos of what happens when they intentionally install malware on their test systems.

http://malwaredatabase.net/blog/

ExamDiff is a freeware text file comparison software for Microsoft Windows. It is an easy to use tool with a clear display of differences between files. ExamDiff also has command line capabilities.

http://www.prestosoft.com/ps.asp?page=edp_examdiff