I have a brief description of what the group is about, then links to posts containing the complete rules/guidelines, FAQs and discussion posts, and a feedback and suggestions post. The posts (except for feedback) is locked to users so they are for reference only.

Putting them in seperate posts allows me to add more information without overwhelming the sidebar, and I am slowly adding information to the FAQs etc so it becomes an ongoing information reference - it may end up being copied into a Wiki or similar at some point.