I have a client who runs a car reviews site with over 160,000 pages. It is a large car news/reviews site updated many times per day. I noticed that we only have 30,000 pages indexed in Yahoo and over 160,000 indexed in Google. Is it just Yahoo...or could something else be up that Yahoo only indexed 1/5 of the pages?
I also noticed we really have took a dive in traffic since mid-march...I think an updated happened sometime around then.