Techcrunch is a blog solely dedicated to tracking new Web 2.0 applications. How embarrassing that my co-worker from the science silo (fellow poster Michael Moyer) had to bring it to my attention, but man am I glad he did. Techcrunch blogger Michael Arrington doesn't just list the latest Web apps, he provides thorough and smart reviews, often long before the apps get mainstream buzz and show up on one of our other favorite sites, Lifehacker. Check out Arrington's review of the not-yet-public airline price tracker, Flyspy—I'm drooling already.—Mike Haney