Late last night I made the switch to Yahoo! Mail's new beta. It's not bad -- just different. So far as I can tell, the most significant changes include a preview pane and the ability to drag and drop messages to and from folders instead of selecting a destination folder from a drop-down menu.

I'm not committed to the new interface, but I'd feel like I was chickening out if I didn't give it a chance. At least I can categorically claim that it's better than Gmail.