The contest started Sept. 7th, and runs until the 21st. Anyone can enter as often as they like. Each day, a post will contain a mention of the contest - by commenting on that post, each person gets one entry per day. The other way to enter is by starting a thoughtful, discussion-promoting thread in the forums, and that is unlimited - you get as many entries as forum topics you start.
Here's the post with the details: http://www.aeropause.com/archives/2007/ ... iveawa.php