Facebook is about to release an email service that will compete with Gmail from Google.
Facebook has bought the fb.com domain name this week and will probably offer the opportunity to facebook users to get a @fb.com email address.
This email service will probably allow you to share attached document and reduce massively spam in your email inbox as you will be able to track who's friend of friend is using your email to spam you.
This post will be updated as soon as this feature is available (should be monday).
In the meantime, feel free to give any additionnals info you might have on this new facebook service.
Be ready to secure the first your firstname.lastname@example.org!