Can there be a setting where the app doesn't automatically check for e-mail even when you don't have it open? I'd love to just go in and manually check - less a battery drain, too!
Also, I know you can turn off sound/vibrate to notify of new mail - what about being able to turn off top-line notifications as well? Again, it'd be a nice option - and a battery-saver!
But other than that, I think it's a darn super app, esp. for 1.0! Now let us know it'll be easy to update to new versions (since it's not an Android Market app, n auto-update right?) and I'll be a happy camper!