While you slept, Cyanogen released his Android 2.1 ROM for the HTC
Hero Dream and Magic (that's the G1 and myTouch 3G, respectively). Most of the bells and whistles are there, save for the new launcher (app drawer) and stock live wallpapers. And while his ROMs for the Droid and Nexus One are painless (and pretty damn awesome), this one comes with a tad of caution because you have to load the "DangerSPL" to get it to work. And if an SPL flash goes wrong, your phone is pretty much bricked. Full instructions are here.
Meanwhile, it looks like Best Buy Mobile is gearing up for some sort of official update to the Hero. As for exactly what or when? Check back later.