i got a site im working on that is creating pages on the fly using php. anyway, i got about 800k pages indexed and all of them targets different keywords, what would be the best practice to increase the ranking for the pages in google? also the last few days ive dropped from 4-5k unique visitors per day to below 3k. i have only done minor changes, such as changing the placement of a few google adwords ads. but i dont think that should have caused such a drastic change. got any idea what coudl have happened?