I learned about Fluxx online somewhere and decided to pick up Zombie Fluxx for my first set. After that I was hooked. I have slowly assimilated it into my group of friends and now no hangout is complete without our games of Fluxx.
I currently have Zombie, Eco, Pirate, 4.0, and Cthulu Fluxx and plan on getting all the others as well.
I want to try Chrononauts and Seven Dragons as well, so those are also on my list.