A quick scan of these 20 previous pages didn't turn up this bug, so I thought that I would add it:

Hardware: Nokia N810
OS: Diablo

Problem: When attempting to enter a password in last.fm using the slide down keyboard, the "Fn" key does not activate the alternative keyboard layout, resulting in the inability to enter numbers into the password field. The layout indicator stays as "abc". I don't believe that you can do upper case either.

Workaround: Use the on-screen keyboard.

Obviously this was pretty annoying until I thought to use the on-screen keyboard.