Ever wanted to have instant information about any trackers used by a website you visit? Then take a look at Ghostery, a Firefox extension that alerts you to any Web Bugs present on a site by placing a Pac-Man type icon in your status bar and providing a list of all trackers found.  
 
Currently tracking 115 web bugs, ad networks and trackers, Ghostery is a simple extension that works by searching for patterns in the source code of pages you visit. With all the matching happening in your browser, you can rest assured it won't be grabbing your data - remember, it's been made to give you information.
Ghostery
akrostpl: We will be using this shortly...Any feedback from any person who has used it?  
Akros Technology
crataegus: Eat hot fsck.
FoolProof: I throw feces in the faces of your babies.
AB: Oh yeah?!  
 
Well I throw faces in the babies of your feces!!!
FoolProof: Dude. Don't badger me. Badger the spammer.  
 
Shit.
AB: I badger who I WANT to badger. Damnit.  
 
Badger Badger Badger Badger.
FoolProof: Do not.