The second beta of iOS 4.1 has been released for developers and users. The changes that have been made are unknown, and if you notice anything different,please  let us know in the comments.
If you’re using a jailbroken device, stay away from it until further speculations go on.


Update:

MuscleNerd from the Dev-Team confirmed that it can be jailbroken with redsn0w.


redsn0w from June can jailbreak today’s 4.1b2 on iPhone3G and ipt2G but see warnings from previous tweet(more and more of the JB infrastructure needs updating as the beta progresses, just like normal apps do, and that’s not priority right now)

[Apple]