Hi Hell-yun!
Yes ICQ is great, but not everyone has enough space on their hard drive, or has an old & slow computer. The other problems can be getting people to use it, if you don't have a lot of experience in chat rooms etc, it can all see a bit daunting. I think an easy to use chat room attached to the IAS site would maximize the opportunity for everyone to join in on a conversation.
Let me see, I used to chat with my Guiding friends on Wednesdays around lunch time, which would be Tuesday night for you.... how does that sound?
Love & gentle hugs
Jo (Australia)