Found this after Dylan wondered if the idea had been done yet. Turns out it has and was funded on Kickstarter not long ago. It’s a capacitive overlay for the ipad soft-keyboard that provides tactile feedback, letting you touch type on the ipad. Works for both 1st and 2nd gen devices now and is available to order from their site - http://ikeyboard.com/
Probably going to order some for Two Lives Left today, we’ll let you know how it goes :).