I mainly use Apple's 2009-version A1314 bluetooth keyboard. I know I'm in the minority here, but I like having less depth to the key. Something about the keys being closer to the body makes it easier for me to type faster (I'm talking a good 10WPM increase from a traditional keyboard [currently around 90WPM vs 80 traditional]).
Managed to snag this one for, like, $25 at Walmart when they were on clearance years ago... Still regret not buying the other one that they had.