Well all, we did a run of keybots, sold them, and we're all out. We built a prototype that worked with PS2 keyboards. Here are some of the issues we ran into:

1) the battery life isn't great. You only get a few hours of typing. This is because the cases we could find only worked with a 9V battery. If we can switch to two AA batteries it will be more efficient, but will raise the cost of the circuit by $10.

2) We didn't have sleep code in the firmware. This would go into a low power mode when you weren't typing. Right now, it 'sings' an FSK song whether you're typing or not. This would help make it last longer.

3) The adapter itself was built as a kit, meaning we used through-hole, big circuit design. Miniaturized, it should be just a thick-ish cable; the chip and a few resistors shouldn't be so bulky. I experimented with powering it with a few penlight batteries, but ultimately the batteries dominate the power usage.

Anyone who still wants these is free to purchase the board and do the kit as shown in iPhone hacks; I'm trying to get a more complete kit available for purchase. Apple still isn't keen on keyboards which deters any serious financial investment in a project like this, so it's up to the hobby circuit to do it.

I'll try to get some updates out soon about the PS2 keyboard version.

-damien stolarz