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Great information.  My understanding was always the same as Steve's .....it depends on the ratio of unique vs. duplicate content.  A while back, I had read that this ratio was something like 80/20 (duplicate not to exceed 20%).  However, I think I will make each piece unique for best results.

If you are looking for an open source solution, I recommend phpBB (http://www.phpbb.com/).  We have used it for a few years for our forum and I'm happy with it.

Is it possible for you to put that listing content in an image?  This would allow you to continue using indentical content on all pages.  However, the content in the image would not be searchable.  If you are just using this content for the user experience, that's fine.  If you want it indexed to add quality to the page, you will instead want to make each listing unique.

90 days is too far out to get people to act now.  You can also put that in the smaller print, but I would word it in general terms and use today's date.

If your page has a php extension, you can use this code:

That code will auto change each day with the date and look like this: Wednesday April 27, 2011