If I want to make an XML sitemap for my site, do I need to map every forum topic in my forum as a separate URL?If this would help, how do you deal with the hugeness of the sitemap for forums with over 100,000 urls?Or is it just meant to map entry pages to the rest of your content?  And can you semantically nest URLS?
XML Sitemaps, what should they link to?
sitemap
If you want to make a proper sitemap that gets automatically updated please use http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=156184&from=40318&rd=1 as your starting point.Google offers the possibility to automatically create a sitemap and update this based on the page visits. You will have to read the instructies carefully.If this is not what you are looking for you might wat to consider creating a XML sitemap using an online tool, such as: xml-sitemaps.comThe idea of a sitemap is to have this point to all pages. You can, however point out the importance of each page using the priority tag.Please note that a XML sitemap is for you to submit to the search engines and and HTML sitemap is to be viewed by your website visitors. Its recommended to have not more than 100 links per page.