If a user has visited the website (not necessarily the forums) within the past 30 days, they are considered 'active'.
Members: 1,233, Active Members: 243, Members who Regularly Post: About 25
Here are some neat lists:
As far as website traffic goes, Soulforce.org receives about 1000-2000 unique visitors each day (that's a true figure that does not include search engine spiders.) 70% are new visitors, 30% are returning visitors. Searches on Google generate nearly 50% of our daily visits. When a story breaks in the press or a major website links to us, we see a spike in traffic.