It works pretty dang well, but as far as I can tell it doesn't actually let you save it as a font file, you can only really use it to send emails from their site.
Which is retarded.
EDIT: This one
seems to work on the same basic principle, but allows you to "download, install, and use". I'm gonna try it out.
EDIT 2: Works much better, but costs 10 bucks a font.