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[edited by: tedster at 2:53 pm (utc) on Mar 17, 2011]
More than that, it is common to see the "0 indexed" message for a new sitemap submission. There seems to be a reporting lag before the crawl of the sitemap shows up in Webmaster Tools.
Google suggests using a sitemap index file when there are too many URLs for a single xml sitemap. Here's the reference: [google.com...]
Yea I just moved to a sitemap index file with three separate sitemaps, and have more URLs indexed than ever before. I dunno if that's why, but either way, I'm happy with it.