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Thanks Maurizio.

What I am really most concerned about is submitting hundreds of sitemaps to Google and giving them concern that we might be spamming them.

This is why I am considering the second approach where we would submit 6 sitemaps at a time which would total no more than 300,000 links rather than giving them 200 plus sitemaps with 10 million links.

I should have been clearer in my reason for this question.  The main goal here is to not have Google freakout because we just gave them 10,000,000 links at one time.

Question, if you had a site with more than 10 million pages (that you wanted indexed) and you considered each page to be equal in value how would you submit sitemaps to Google?

Would you submit them all at once: 200 sitemaps 50K each in a sitemap index?

Or

Would you submit  them slowly?  For example, would it be a good idea to submit 300,000 at a time (in 6 sitemaps 50k each).  Leave those those 6 sitemaps available for Google to crawl for 7 days then delete them and add 6 more with 300,000 new links?  Then repeat this process until Google has crawled all the links?  If you implemented this process you would never at one time have more than 300,000 links available for Google to crawl in sitemaps.

I read somewhere that eBay does something like this, it could be bogus info though.

Thanks

David