I've made some new forums for the club since we now have so many members. I felt they might be put to good use. There is the "What's Your Progress?" Forum, where you can post threads to promote your own 100 Theme Challenge work. Link them all up in one place for all to see.
Then there's the "Comments, Ideas, and Feedback" forums. There you can post up new ideas for contests (yes contests), forum categories, new challenges, or just give general feedback or comments on how the club is running.
The "General Chit Chat" is what it implies. Just there for when you're bored and want to post something or have a conversation. Please, be considerate of others and the topics they create. Don't derail the topics.
The "100 Themes Help" is for when you just can't make any progress on your own personal challenge for lack of ideas, artists block, or what have you. Talk it out with other users and you might get some inspiration.