PRIVACY

I dont think that collusion blocks any tracking. I think the tool only shows you who is (and its a good tool).
Other ways to block tracking your browsing is (ranked in order of success):
- https://www.torproject.org
- use Google Chrome and browse with an 'incognito window' (firefox may have a similar option)
- using a tool like collusion to find out who is tracking, and block them. a good way to do this is via the hosts file: http://en.wikipedia.org/wiki/Hosts_(file)