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surfgatinho - 3:04 pm on Mar 18, 2008 (gmt 0)
I'm not sure why people are still using sitemaps. If you need a sitemap for your visitors just offer a site search, I think people will not read all your sitemap links, using a site search is better in this case.
You really don't need a sitemap even if you have 1M URLs, you just need a good information structure. Google will find all URLs if PR and information structure are fine.
Another good reason for sitemaps is it allows you to spread the PR juice a little more evenly around your site