Where to next ?

Main squid project
http://www.squid-cache.org/
Official website with release information, bug tracking, mailing list archives and more

Squid hackers project
http://squid.sourceforge.net/
Weird and wonderful ideas a bunch of hackers have before we integrate them into the main squid tree

This talk (and others you might be interested in)
http://www.creative.net.au/talks/
My website with the past few talks I have done on caching