Timmy,
1) A modded morpheus, that presents the best UI change I have seen, Incorporating tabs, and a always present search box.
screenshot...
http://home.attbi.com/~darkstar559/stuff/morpheus2.jpg
2) Old kazaa builds
http://ftp.pu.edu.tw/Cpatch/other/kazaa/source/
and here
http://ftp.nchu.edu.tw/Winsock/other/kazaa/source/
3) For refrence to those who want the original Disassembly of Kaza listing...
http://www.new-wave.net/gift/dis/rlandor.html