Yes qwerty12 compiled the driver for that card/dongle for OS2008 Diablo. It supports injection and such. The only issue I have is that connecting to routers with it is unreliable (DHCP issue) but I am working on finding a solution.

The N900 does not have micro-usb AB connector nor a USB OTG integrated chip. Thus at this point, no the N900 does not have OTG. However, surely someone will figure out a workaround. I'm waiting for the N900s successor and hope Nokia wakes up for that device.

I mentioned keyboard as a plain usb keyboard uses very very little power. I recently built a usb drawbox but don't have the measurement handy and would have to borrow a multimeter to check. A thumbdrive is another example.

Also I read in another thread that out-of-the-box Fremantle doesn't include a bluetooth keyboard profile (HID). So yeah.

Makes me want to stick to the N8XXs.