The chatpad is ergonomic, formfitting, backlit, tactile feedback and just alomst perfect. I got tired of waiting for microsoft to release drives to use chatpad on windows
The solution I came up with is
http://www.youtube.com/watch?v=sgVxEUxQrGU
Its a video on using using a madcatz wirless thumbad as a replacement which is made for PS3.
Pros
Works on windows and xbox 360, great with flight simulatorsand rts, rpg, games like World of warcraft since it has F1-F10 keys,usage time lastlonger than the chatpad, usb rechargeable from side, compatible with almost anything thathas aUSB conncetion. Pretty good for HTPCing or vehicles depending on setup, its only $29.99 if you can still find one.
Cons
Its not backlit and buttons could be a little more tactile.
I wrote to madcatz to make a backlit version for xbox360 but they claimed they don't have the license to do that. Let me know what you think and see if you can make it more streamlined!