Not to try to breath life into a dying thread, but here's a slightly off-topic thought....
When I first signed up for AH in the Fall of '04 (I think), I had no idea that 'numbers' weren't the ideal screen name to use. I chose 5411 (my house number). It didn't take too long to realize that an alpha name would be better, so changed it. My point is, during the initial sign-up, I think it might be beneficial for HTC to display a note on the sign-up page suggesting that screen names be pronouncable alpha characters, as opposed to a string of numbers. Just a thought....