I use MVP's Hosts File and download it etc. with HostXpert because it does enough for my needs.
If your Spybot is the main thing you use to keep your PC "clean" they have a good system to keep the hosts file up to date..even taking some false positives out. .if you use hosts for blocking. I think it is all optional..it might be on by default..but you can turn it off. »forums.Spybot.info/showthread.php?t=34553
Old post on where does the Spybot hosts file come from.
But don't use more than one program to play around in the Hosts File...and when you are done..not a bad idea to make it read only ( although that is not a %100 guarantee Bob won't ring your bell) -- Gladiator Security Forum »www.gladiator-antivirus.com/