It's been a long time since 2006.
The Chicago Ghost Hunters Group has evolved greatly since then.
Check it out:
http://www.meetup.com/ChicagoGhostHuntersGroup/
407 members, 113 past meetups, 3 meetups a month with additional investigations
http://www.chicagoghosthuntersgroup.org/
Our official website
http://www.youtube.com/user/ChicagoGhostHunters/videos
Our official youtube profile