Tahoe Social was a startup to create a social search engine for the Lake Tahoe Basin. The goal was to create a 'one stop shop' for everything a visitor to the area might want to know including business pages and reviews, travel information and arrangements to hiking and recreation guides.
Liferay 6.1, Tomcat, Vaadin, Velocity, MySQL, MongoDB, Sencha
This unfortunately went the way of most startups. Lessons learned: start small, get it out fast, do it with someone else's money. :-(