Forum Moderators: skibum
1. Make sure the pages are easy to be found by the spider (good linking structure and/or site map)
2. Avoid (almost) identical pages
3. Avoid parameter names that could indicate a session-id (like in: www.mydomain.com/products.php?id=2345)
4. Get enough PR on the home page. A site with PR1 on the home page and thousands of sub pages, will have a problem to get those pages indexed. Don't forget to link back from those sub pages to the home page and/or a higher page in the directory structure.