I'm getting a 'URL Timeout' error on the Google Sitemaps site but I can load it fine. It's only 212k, has ~1300 entries, and no encoding problems reported. Any ideas? The file is here if any cares to test and tell me if they get a timeout. http://www.trainmark.com/sitemap.xml
No timeout from my side ... You might want to rename the sitemap file and re-submit it. Google sometimes caches "too much" (like errors ), by renaming it you're forcing them to take a real look once more.