http://ajaxian.com/archives/getting-semantic-with-microformats-series-by-emily-lewis

Google Map Utils

http://www.phatfusion.net/ - interesting JS sample

Opera study: only 4.13% of the web is standards-compliant

http://www.loki.com/
http://fireeagle.yahoo.net/

Firefox: Geode

JQuery API Reference

How to design good API and why it matters

http://smushit.com/ - Image optimizer plugin for firefox.

javalid - An example to create my own validator annotation. This is for project enhancement.