Got mine in the mail yesterday, loaded switches & LED's, and hacked it -- trinket w/ the most utile ever !
I do have one remark tho -- if there ever will be another batch made, I would strongly suggest to change the LED resistors to 1 kOhm (102). Right now they are 100 Ohm (101), driving most LED's betw. 14mA (3.6V LED) and 31mA (1.9V LED). I got a bunch of different LED's from maxkeyboard and digikey and all are fine w/ currents 1-5mA. The lowest resistor I'm using w/ those is 1k (blue, orange), the highest 3.8k (white, pink, green). I replaced the 101 resistors w/ 102 on my two cards, works well.
BTW, if someone is looking for bright LED's -- try
this green one if you dare.
Do not look directly into them while on ! I am serious. Nasty little buggers.