We've been watching this discussion with interest for a little while now, and it appears that it's finally working. A gent who goes by infinitemods has hacked the back of his Evo 4G so that it charges from the Palm Touchstone puck, meaning you don't have to have anything actually plugged into the Evo. Infinitemods told Good and Evo the hack took him about a half-hour, and that it probably can be done in about 10 minutes.
The downsides to this DIY project? The magnets used to hold the Evo to the Touchstone mean the compass won't work, and the battery cover sticks up just a tad. He also tells G&E that overheating hasn't been an issue yet -- one that we'd watch closely given the occasional problem with the Palm Pre.