Lots of things have happened with the keyer. I bought rotary encoders and had boards made and populated one and it works like a champ. Only one small error on the board, and it's in the silkscreen so I'm going to ignore it, although you can see it in the photo above. So, if you have an interest, how can you get your own keyer?
Well, start at OSHPark and get yourself some of the boards:
The source for the firmware is on Github
The hardware design (including schematic, gerbers, and bill of materials) is also on Github
The documentation, such as it is, is on (you guessed it) Github
Questions can be directed at my email address: email@example.com