I know the mods are thinking "oh no". But this thread will be different than "what should I get when I jailbreak" or whatever. I want to know specifically why you jailbroke. Did you see it on the Internet, a forum, or did you hear about it from a friend? Did you hear a specific tweak or hack that persuaded you? What made you want to show apple they can't control everything, and void your warranty?
I heard about ibluever. Loved it from the beginning. I have a verizon cheapo phone with unlimited data, but I have a wifi only iPad. So, Bluetooth tethering was my pusher. Love being able to surf anywhere for $10 a month for unlimited data instead of buying a $600 ipad with 3G and signing a contract.
And I always like to hack stuff, just because I can.