I have a project which is space sensitive and basically requires only one analog input. The device should however be automatically recognized (as in, I dont want to worry "which com port is it" as I have to do with Arduinos)
I like the teensey, becouse rumor has it I cen let it emulate a USB device: http://www.pjrc.com/teensy/
I like this formfactor a *lot*: http://www.phidgets.com/products.php?category=0&product_id=1011
Both of these products feel overkill for my needs though.
What I want to do is basically create an additional scroll-wheel for moving through contents, such as a website. It should have the form-factor of a flash-drive, or usb dongle.