Just Completed: VillageHeartBeat.com.  Previous Project: Web 2.0 Application wrote from start to finish for Yahoo!, that internal employees and chosen vendors use to create content/modules for use on Yahoo's US Front Page.
(This Web 2.0 Ap employs Object-Oriented JavaScript/AJAX/JSON, YUI/Yahoo User Interface, Object-Oriented PHP5, MySQL DBs, XHTML/CSS, XML/XSLT on a Unix/Linux/CVS platform...and was also in use or planned for use by Yahoo's Argentina, Mexico, Singapore, and Telemundo Front Pages, as well as other subordinate pages.  More...)