While I agree that WebOS probably has the best notification system, I don't think there's any argument to be made that the notifications on iOS are far inferior to the way Android handles it. Yes, I suppose there's a bit of a janitorial aspect to the notification shade, but at least it's out of the way and doesn't interrupt what I'm doing. The iOS method is just horrible. I hope for my wife's sake that they do something about it in the next revision.
I have a few issues with the shade system, but personally I really like it. Though Tom, I understand how irritating it would be with your email to still have the notification there if you've checked it on another computer. Does it do that if you're using IMAP? I've only ever used GMail, and the notifications go away if I check my mail using the web site.
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Matt