Aye, I didn't even know they made any, so I hacked up an adapter: https://github.com/ehalferty/arduino-usb-to-adb

There are other (non-DIY) USB-to-ADB projects out there taking shape, too.

But I'm also hoping someone starts making Nubus cards for VGA, USB mass storage, etc. It would just take an FPGA or perhaps even an overclocked teensy.