In my search for the best sitemaps plugin I installed google xml sitemaps 4.0beta4. At first I wasn't happy and disabled it but found the redirection for 'sitemaps.xml' was still happening and causing some greif. Once I re-enabled it and figured out how it was actually working I was happy with it. I still am.
However I found that my next page (/category/blog/page/2) links are not working. I disable my plugins and they still are not working. I rebuild my permalinks and they are still not working. I have a feeling there are redirects within the database that I can not find under the options table no matter how are I look.
So I dont have exact proof that sitemaps is doing this, but I was thinking this might be the best place inquire about the redirection since it was performing the redirection even after I removed the plugin and this happend after I went to 4.0beta4.