I'm VERY suprised this hasn't been requested ALREADY!
I would hope I'm already being pre-empted by the WP team if they're truely working on better multi-blog/multi-author abilities for WordPress 1.4 buuuuuuuuuuuut...
Why not have the ability to make a public profile page?
Support for contact info (e-mail, AIM/YIM/MSNM/ICQ/Jabber, etc.) and more.