HOW IT WORKS:So, if that sounds like fun to you, hop on over to the forums and give it a try. Sign-ups for this challenge began 10/30. The topic will be posted on 11/6 and we'll all be posting our responses on 11/11 (so watch this space!).
A forum thread is opened for signups, for people to participate. Ideally we'd like new folks to the challenge to register to the forum, but that isn't necessary. Currently (and this will remain as long as it isn't abused) guests are allowed to sign up for challenges.
The signup thread will remain open for five (5) days. Participants are asked to write a short announcement on their blogs in case any of their readers and lurkers would like to participate.
At the end of five days, the Mystery Topic will be announced by the previous winner. As of now, the winner of the last challenge can choose to participate, or they can sit out the challenge. If the previous winner does write a post, he/she will not be eligible for voting. This is to ensure that everyone will get to choose a topic at some point. If this doesn't work, we might change this to someone volunteering for thinking up the next topic.
Once the topic is announced, everyone will have five days to write their post. On the fifth day, everyone will post on the same day and go to the signup thread to post the direct URLs of their challenge entries. At that time a poll will go up and voting will remain open for 5 days. At the end of 5 days a winner will be announced and they will get a nifty graphical award to "pin" to their sidebar.
EDIT: Sorry -- that'd be 11/13, not 11/11.