USB Bit Whacker

This board is the USB Bit Whacker or UBW. It's the cheapest USB capable PIC at $25.

Another one

This board might work too. It's from sparkfun.

CW to USB keyboard

I haven't built the cw to usb keyboard yet, but when I do I'll use the CUI and it might take more than a month. Christopher G. Prince sent a byte from linux to the CUI in about that amount of time. Simon Gustafsson had the same idea in at least 2007. JonM who presented on HAM radio at defcon directed me to this microcontroller from TI. It doesn't do I/O via USB though, but it is waiting for me in a fedex package for half the price of the CUI.