According to Google, while submitting a site map is one way to let them know you have new pages on your site, it is no guarantee your pages will be indexed.
The same criteria apply for pages that are submitted via a site map as for pages Google finds on their own. Their algorithm has to indicate the pages are "important" enough to warrant it before they're going to send a spider to index the pages and add them to their database.
Pages that are important will get spidered right away. Pages that are worthy, but less important, will go into a queue and will get spidered as they get around to it. Pages that are unimportant are pushed down to the bottom of the queue and may or may not ever get indexed.
To get your pages indexed faster and more regularly, you need to signal to Google that your pages are more important. The way you do that is by getting other high-quality sites to link to yours. And the way you do that is by offering a website that's chock-full of useful, interesting and/or entertaining content and making sure others are aware of it (but in a good way, so they'll link to you, not so they'll "out" you as a spammer or anything like that), and by asking for links when it's appropriate.
--Torka
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Diane Aull - NineYards.com: Helping Businesses Do Business Online
Whether you think you can, or that you can't, you are usually right.
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