I'm going to go ahead and admit to doing bluetooth file transfers pretty regularly. Sure, WiFi might be faster, it can be more cumbersome sometimes too. Specifically, I'm usually transferring files from my Air to my n800, and since the n800 doesn't see the Air's shared folder when they're on the same network, then just using bluetooth transfer is much easier. I just tell it to send a file to the n800, and pick the file. I usually get my transfers going around 150KBps, so unless it's something really big, it doesn't take long enough to justify doing it another way.