With 'dir' you could build a directory service where users send you a tweet containing another user name and you would return a link to a page with all the info

With 'dir' you could build a directory service where users send you a tweet containing another user name and you would return a link to a page with all the info you could find about them. For example: '@dir paulg' would result in me getting a link to a page that contains other public profiles from pg and links to his personal site and YC. Not sure how much of a business this is, but I guess it could be like the yellow pages for twitter.