I believe Eris is still running like 1.5, I've heard rumors that 2.x will get pushed by the end of the quarter, but that was from the sales rep so..... For now I'll use the workaround.
Haha! Maybe HTC will do a better job and maybe VZW will have their act together for you folks, but we heard that promise a few times before we got 2.1...
In any case, the workaround I supplied for you will also allow you to use a song as an alarm clock notification. I just remembered that. When you go to select ringtone for the alarm, I believe it's in there. That's how it worked on my G1, anyway, and I'm pretty sure it was running 1.5 or less the last time I could get it to turn on...