I have a site http://www.jobext.com/ which has lot of dynamic pages. I am trying to do SEO for this site since last one month. Initially, my site has approx 2000 pages indexed in Google but now it reduces to Approx 1600 when i am checking with site:www.jobext.com, where as i am doing regular SEO for the site, building backlinks too. Why my pages are not indexing (especially inner pages)? and how i can get fast indexing as it is not possible to bookmark all these pages as fast?
Seo is a continue process. Do not do excess work that makes your impression as spammer.Check your work & if your seems more problem than contact google webmaster forum.Google it.
check your inner lining and as bob suggested if the problem persists contact google webmaster. If you didn't pay attention to this before this may come as a surprise to you, but pages go on and off index, so if one week you have 1800 pages indexed and the next 1600 don't raise an alarm, wait a week and see what happens.
i think if you create a few web 2.0 backlinks, then your pages should stay indexed for a long time, even bookmarking may help.
if you check for indexed pages on google.com you will never see a right picture. keep building backlinks, usually that helps indexing.
Have you tried "Google Webmaster Tool"? Sometimes it gives you valuable information about crawler errors. Such as duplicate title, robots restriction etc.
It takes time to develop trust with the search engines. Things you must consider are removing duplicate content created by dynamic pages. Also internal linking is very important for indexing your entire site.
google reevaluates your site every ones in a while and adds/removes pages to/from index as it finds other sites with somewhat similar content, etc