I noticed that google stopped indexing my site. The last time google indexed my new articles was 10 days back. I regenerated my sitemap but still the same.
Try to get more back links.. Participate in deep linking so that google will index your inner pages..
Just my two cents... Google was indexing my site pretty well until I submitted a sitemap. Then, not only did my indexing stop - also my traffic died off almost completely - all my rankings tanked. No idea why. My opinion is that Google can find your pages just fine without a sitemap as long as you have a logical structure to your site. I would build links to your top and sub level categories using social bookmarking etc. Also, on page links (in modules etc) to your lower level categories will help alot.
I think it takes around 2 weeks for the new content to reflect in the search results if your site does not have a high PR. Atleast that is the case with me.