I had this idea for a php script where everyone would add their own msn messenger address, then it would output a ctt file so everyone could add each other. okie, well, ive worked the bugs out:
http://www.flipa.co.in/msgplus.php
To add the emails that people have added to your msn messenger contact list, download
this file and save it as a ctt file, such as msgplus.ctt. Then start msn messenger, goto the contacts menu, click import contacts from a file, and open the file you downloaded.