Another attempt to fix the broken Email system.
Google announced Priority Inbox feature in Gmail to help wiht email overload. Priority Inbox helps with the emails that are not classified as spam, but are unimportant. As messages come in, Gmail automatically flags some of them as important. Gmail uses a variety of signals to predict which messages are important, including the people you email most (if you email Bob a lot, a message from Bob is probably important) and which messages you open and reply to (these are likely more important than the ones you skip over). And as you use Gmail, it will get better at categorizing messages for you.
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Priority Inbox will be rolling out to all Gmail users, including those of you who use Google Apps, over the next week or so. Once you see the "New! Priority Inbox" link in the top right corner of your Gmail account (or the new Priority Inbox tab in Gmail Settings), take a look.
I still think the only way to make email really productive again is to get email addresses authenticated.