Only problem with using protowall is that it does no good if you happen to be using a proxy, did a test to see off a second pc of mine, stuck it's ip to block into protowall and used a socks server on the pc, connected to it with no problems, stopped using a socks proxy and couldn't connect at all.
Noticed that before when using a proxy with me webbrowser and kept getting ad's in that i knew were blocked on protowall...
If yer not using a proxy then protowall and the blocklist manager work excellent for blocking out assorted ip's as long as you keep yer blocklist sources updated....