Ah, the IBM keyboards. Sigh. I like switching boards between work and home, and I'm constantly searching for keyboard nirvana, considering that I loathe using a mouse and love All Things vim, for instance.
I'm currently using a Matias USB 2.0 at work, and sometimes I use a MS comfort curve. At home I currently have the original Apple BT board but I don't really like it -- it's just the best BT board I've found so far. I also don't particularly like typing on my MBP keyboard, though I really like (and miss) the Kensington SlimType board.
My favorite laptop board is definitely the Thinkpads without the touchpoint. Favorite desktop board to date ... gotta go with the IBMs but partially because nostalgia. Not really willing to pay more than ~$40 for a board these days, so I am currently looking to get another SlimType.