Four short links: 8 September 2009

Mobile jQuery, API to Google Book Search, Open Learning, Popularity Algorithms

1. jQTouch -- jQuery library for mobile web app development. (via brian on Delicious)
2. GData API to Google Book Search -- search full text, get back metadata, modify "my library" collections, etc.
3. Open and Free Courses at the CMU Open Learning Initiative -- rather than just a lecture and handout dump, it has interactive exercises and questions to help you practice and figure out whether you've learned the subject. (via timoreilly on Twitter)
4. How to Build a Popularity Algorithm You Can Be Proud Of -- description and brief analysis for the popularity algorithms in Hacker News, Reddit, StumbleUpon, Delicious, and Linkibol. A basic collective intelligence technique that's not obvious. (via Simon Willison)