Peer Guardian and Filetopia
Some quick notes on cool tools that I've been exploring lately around the area of IP blocking
* "kazaa-lite":http://www.kazaalitekpp.com/. This is clean version of Kazaa. Doesn't have spyware. Also implements IP blocking through a central "list":http://kazaalite.host.sk/dl/BannedIpRanges.txt. The list itself is an interesting read for nerds.
* "PeerGuardian":http://peerguardian.net. This is a general purpose IP blocker. Sort of like a lightweight personal firewall with automatic update of blocked IP addresses. Works great because the IP list gets updated daily, but in current releases 1.99 and 1.98, it is very resource intensive. Fascinating to see my personal machine banged by doubleclick all day.
* Filetopia: Your secure file sharing and communications tool. Got a good review from some of the folks at peerguardian.net.