fitsquare sends users real-time messages in order to encourage them to check in to healthy venues on foursquare. They can also earn exclusive badges, compete against friends and track progress. Plus it's completely free to participate!
Your Mashup not listed on ProgrammableWeb yet? Tell us about it and get listed.
flightwise (formerly fboweb.com)
Tutorial for a IP to geolocation aggregator script
Yahoo! Search API Tutorial
Java RESTful Web Services With Jersey and Twitter
jQuery Twitter API
Twitter .NET API
Become a ProgrammableWeb Sponsor
APIs, mashups and code. Because the world's your programmable oyster.
Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.