Domodomain is a web stats package that goes an extra mile and resolves visitor domains so that instead of some IP gobbledygook you are actually looking at company names. I tried to build something similar in-house years ago while working on a B2B project and if this works as I think it works, it's an invaluable tool. If you are a blogging student of advertising, you can figure out what agencies are reading your stuff and target your applications accordingly.
