Ah, very cool. While the code looks good there, Hotmail and Yahoo seem to be doing something a little weird to it.
One other question I have is about background images on HTML emails..
I made the text an image for this email because I read that Gmail can drop background images. For example, if I assigned an image as the background of a <td> so that I could type over it, certain Mail clients might drop the background. however, i tried this and it rendered fine in Gmail, Hotmail, Yahoo, and Mail. I'm still hesitant to put an image as a background because of what I've read. Do you know about this?