Well that was fast! A tweet from MuscleNerd reports that the iOS 5 beta on a fourth generation iPod touch has been jailbroken.
iOS5 jailbroken on ipt4g: http://is.gd/7GxIcK http://is.gd/BwPvfh via limera1n + tethered boot..not too many surprises 🙂
While this is great news for jailbreakers, it is still too early to make any conclusions about the iOS 5 jailbreak tool. So, if you require/enjoy having your iOS device jailbroken, avoid iOS 5 for now.