I had problem uploading my sitemap to Google’s Webmaster Tools since October 22. Google used to pick up my sitemap in about 30 minutes, but this time it showed last download is October 21 and it had been pending for more than a day until it finally downloaded it. In the mean time I also submitted a sitemap for my new website, but I really caught the bad time and it took me three days before Google download the sitemap for the first time, ahhhh. I googled around and checked the Google Groups about this issue and I found out that many people had the same problem and it was something to do with Google. Hopefully they will fix this soon.