I love YAM too. And besides the HTML viewing, I can't think of a single feature I'd want added. I don't even really care about the HTML viewing because I can easily view it with iBrowse using HTMLread. (Also, I agree with the "Boycott HTML emails" website, which explains that bloated HTML mail was created to improve advertising and perverts the original vision of email as efficient text communication)
YAM is MUCH more fun to use than the crappy Outloot(sic) I have to use at work.
