MuscleNerd has announced on twitter that a beta TETHERED JB for iOS 5 Beta 1 is available from the Dev-Team Blog.
AND FOR THE AVOIDANCE OF DOUBT THIS IS NOT FOR IPAD2 OWNERS!
Only devices which are already pwnd for life are supported, so for our purposes, this is the iPad1
The JB beta is for Mac developers only, otherwise you are being a dirty rotten pirate, and you know what we say around here... Don't be a Pirate!
If you are a registered developer, fill yer boots. However, be warned...
No support should be sought or provided on these forums in relation to this beta jailbreak.
The Dev-Team Blog is VERY CLEAR that lots of stuff is broken. This release is really for JB developers to help get their apps and tweaks ready for the iOS5 release. It is not for the general public!