I've just tried the pre-built kernel image "uImage-2.6.16-omap2-e3" from http://the.earth.li/pub/e3/2.6.16/ which I believe has Matt Callow's mailboard patch applied.
The mailboard gives me strange results... I can't get the forward slash to work, and some of the "shifted" symbols on the number keys generate the wrong symbol.
I've missed something haven't I..? Do I need to setup a keymap under Linux to get this working? Or should it generate the right keys straight out of the box?