Right, ok, this is what I've got from just fiddling about on the PS3:

F1 = Triangle
F2 = Square
F3 = Select
F4 = Start
Enter = X
Esc = O
Windows key = PS button
Arrows = d-pad

Also, I plugged my PS3 controller into the PC, and got these numbers from each of the buttons. I don't know if you'd be able to use these to actually make a gamepad profile. Anyway, the left analogue stick is the X/Y axis, and the right analogue stick is the Z axis. The d-pad is 8 way and comes up as Point of View Hat (?). Anyway, the buttons:

1: Triangle
2: Circle
3: X
4: Square
5: L2
6: R2
7: L1
8: R1
9: Select
10: L3 (Left analogue click)
11: R3 (Right analogue click)
12: Start

The PS button doesn't work on the gamepad in USB mode, but I'm sure the Windows key could be used for that.

Thanks for making BlueMaemo in the first place I'd be more than happy to test things for you, hope you find this of use!