I'm adding a preference pane to the IMAP-IDLE plugin. To the right is a screenshot of it in its currently "woohoo it's loading my nib but it doesn't really do anything yet" state. And yes, that's a piece of toast with a postmark on it. IMAP-IDLE: your Mail Toaster™ -- or something like that (apparently I'm feeling a little silly at the moment). The URL in the screenshot doesn't work yet. But ask, and ye shall receive -- that will be the "permanent URL" for information about IMAP-IDLE for Mail.app.