The Beta 2 Mango Windows Phone Tools are available to developers today! Included with the beta is the ability for developers registered with the AppHub to flash their retail devices.
I know there are some non-developers out there that want to also flash their phones and they may wonder how they get get their phones reflashed with the Mango beta. For the time being they cannot. There is an inherent risk in reflashing the phone; you could end up with a bricked phone if something goes bad. If this happens Microsoft has budgeted to take care of repairing up to one phone per developer. But Microsoft doesn’t see this risk as being appropriate for user audiences. [Some] developers on the other hand are willing to risk their device’s life and limb to have early access to something new. If you brick your device today Microsoft won’t be prepared to act on it for another couple of weeks. That’s not the best case scenario. But the alternative was to wait another couple of weeks before releasing the Mango tools. If you don’t feel safe walking the tight rope without a safety net then don’t re-flash your device yet.
According to the Windows Phone Developer site if you are a registered developer you will receive an e-mail inviting you to participate in early access to Mango.