Web services bustin' out all over. Niall Kennedy notes that Amazon has updated it's e-commerce APIs and made Alexa site information available. Hat tip to Greg Linden
Here's an interesting study, maybe. Take a set of "popular" URLs. Say the del.icio.us most popular, run them through Alexa's stats, ship off to Google's API, check out some other social bookmark services, maybe even see if Technorati has any recent information and see what you get. Perform on a regular basis and build up profiles based upon a number of different sources.
Call it 7 habits of highly successful URLs.