GreenPois0n RC5 for Windows and mac -- http://greenp0ison-jailbreak.blogspot.com/
Notes:
- NOW WILL JAILBREAK VERIZON IPHONE!
- works with ALL devices, except iPhone 3G. use redsn0w for that.
- if you have an unlocked iphone 4, DO NOT UPDATE YET.
- will this delete my music and apps? - no.
- if you hav any issues when jailbreaking hold the home and power buttons on your device until it reboots.
- if your anti-virus detects that greenpois0n is a virus turn it off and then do this jailbreak. its safe, i promise.