Hi, How do I know if Google is listing my Blog in a generic search of keywords ? (even if it is 40-50 pages down the line ) .... PR?
There is a lot of software that can check this for you, just google it using the right terms and you'll find what you need!
If you simply want to know your PR, you can use checkpageranking.com to find out. It will also give you some information relating to SEO.