Us, Hero owners, have been waiting for an OS upgrade for a loooooong time, since the phone got released last October with Android 1.5.
At first, we were hoping for 1.6, then 2.0, and finally 2.1 was promised ("Totally for real this time, yo" - said Sprint and HTC but we saw nothing).
Android 2.1 On HTC Hero
Therefore, when a Hero Android 2.1 build got [inadvertently - oh, the drama with these leaks!] leaked online, and an Android ROM hacker by the name of damageless (hi damageless!) incorporated the code from the leak into his ROM, called DamageControl, we knew the finish line was near.