http://www.goodandevo.net/2010/05/tr...h-htc-evo.html
Seems like Android's support for BT HID isn't there, unless you root your device.
I think HTC should have done more with the Evo's HDMI port. With the right setup, the Evo could be used as a portable computer replacement/substitute. Imagine if you could connect a BT keyboard and mouse to the Evo, and use the HDMI to connect a computer monitor. Of course you would only have some basic functions, but for someone that doesn't want to spend the money on a netbook/laptop/extra desktop computer and has an extra monitor lying around, I think the Evo could make a decent replacement. Or for those that want to browse the web in their living rooms (lol just for theory's sake lol), you could hook the Evo up to your TV, etc etc.