jQuery

I've spoken with John Resig a few times, both at Bar Camp Boston, and at one of the Boston Geek Dinners put on by Adam, Bela and Pito. John is a smart guy with some impressive javascript ninja skills and one of his projects is jQuery. jQuery is a really cool library for javascript that allows you to write code in a clever and compact way. Check out their new 1.0 release!

(Note Grazr doesn't use jQuery, but I definitely think it's nifty)