Hi everyone, It's a PR 4 site with lots of edu and gov as well as some wiki backlinks. 2 years old. Having around 1,000,000 pages indexed on Google and around 550,000 images cached on Google Images. I don't know why the index rate is very very low now. The traffic drops from 8K to 5-6K. The site is updated ~500 posts daily with fresh contents but the index pages are still 1,100,000 for over one month. Anyone can give me advice? What's happening?