check out Aaron wall seo tools, it might answer a lot of your questions, also it shows what pages are listed in yahoo, and etc. and how many.
I will be releasing some plug ins here soon for firefox, plus I'm in the process of writing some software under c++ that will determine a sites density factors, page rank, and many more things, and it will show you what factors go to what search engines, and the software will have updates on it periodically, i will have a plug in for Firefox which are pretty easy to make, and the c++ software I plan on writing will take some time cause of complications.
www.seobook.com its free, just plug it into your Firefox, also for Google look up
also for google to check to see how many pages are indexed use site:
www.yourdomain.com
hopefully i answered your question direclty