I wanted to take a few more minutes to relax before getting back to work, so I was online. And suddenly I noticed something. The Apple USB keyboard has nice concavity on the top surface of all the keys except the ones on the lowest row. What's up with that? I guess I don't mind with the space bar (nice big key, kind of hard to miss), and I guess the ctrl, alt/option, and command (open apple/windows start) keys don't worry me too much, but the keypad bugs me a bit now (0 and decimal not concave?!), as do the arrow keys (up concave, but the others convex?!).
Just thought I'd share. Good thing I don't use the arrow keys much nowadays (thanks to a scrolling mouse), because otherwise, I would probably be driven crazy now that I recognize that only one of them is concave. Of course, the fact that I didn't notice for so long probably is because I don't use those keys much.