Facebook rolls out e-mail of the future

So now that we know what Mark Zuckerberg and Co. were up to, what do you think of the new Facebook messaging system? If you haven't heard, Facebook has dreamed up what Zuckerberg believes is the e-mail of the future (though he's being very careful to say it's not e-mail as we currently know it, and it's not designed to be a "G-mail killer.").

Basically, it's more like texting than e-mailing. You could use it to send a friend a text, a traditional e-mail or an instant message from inside Facebook. Instead of having all these different functions spread around different accounts, as many of us do, you could handle all those tasks from one simple interface. It would also collect all such messages from your friends and prioritize them based on your social graph. Oh, and there will also be a @Facebook.com e-mail address you can use if you'd like. The changes will be rolled out in the coming months.

Good ideas? Or just Facebook's latest attempt to middle-man your Web life?