Jaslabs: High performance Software

By Justin Silverton

1) http://forum.deviantart.com/

Name: Deviant art

Description: Online Art community

Posts: 5,390,933

Members: 5,068,184 

2) http://www.gaiaonline.com/forum/index.php

Name: Gaia Online

Description: Anime roleplaying community

Posts:  819,515,279

Members: 4,924,634

3) http://collect.myspace.com/index.cfm?fuseaction=messageboard.categories

Name: myspace

Description: Social networking and dating site forums

Posts: 912,500

Members: 4,150,200

4) http://www.imdb.com/boards/

Name: Imdb 

Description: Movies message boards

Posts: 13,087,050

Members: 4,111,600

5) http://bbs.imobile.com.cn/

Name: IMobile (chinese)

Description: Mobile phones community

Posts: 16,018,061

Members: 4,016,125

The top bulletin board being used right now is vbulletin, which was built using php/mysql.

More statistics can be found here: http://rankings.big-boards.com/?sort=members