Apple released iOS 5 Beta 6 to developers last Friday, and the latest beta software has already been jailbroken with Sn0wBreeze. The Dev Team has now released RedSn0w 0.9.8b6 "Jetblue Edition" for a tethered jailbreak on iOS 5 Beta 6.
iOS 5 Beta 6 is one of the last beta verisons expected to be released before the final GM build of iOS 5 next month.