Wizard - 12:52 pm on Mar 20, 2008 (gmt 0)

If your site don't have linking structure good enough to make it indexed without a sitemap, it's worthless anyway. Spreading PR evenly through the site makes no sense too, PR is money and not every page is worth the same investment, because each page has different revenue, depending on its topic. It makes sense to make limited sitemap for top performing pages, and recently added pages, while the rest of pages has to be linked with good internal linking logic.