My feedback to Y! on their current beta mail system:
Bandwidth hog. What is this trying to do, look like a fully-featured mail client using flash? I might even switch over to Thunderbird or something. That's what most of the cool geeks are using. I'd rather have fast functionality than animation and shine. When action in my other browser tabs is lagging due to something going on with my mail, I'm not going to keep it. I may have broadband, but I prefer the lightning load of dial-up friendly pages to something that doesn't do anything special and takes five seconds to load. If I'm already loading five movies to watch, why the hell do I want to wait to get my mail? Shiny but stupid concept.