Bumpr is a free service storing track logs from your GPS device and rendering those track logs as time-based Google Maps for you to share.
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Road Sign Math
LiveMap Theatres & Venues
Google APIlity Library
Make data from the Tixik API available on Locago.
GeoPicker Widget API - Easy Latitude / Longitude lookup for forms
Tutorial for a IP to geolocation aggregator script
MediaWiki Widgets Library
Jon Udell Google Maps Screencast
APIs, mashups and code. Because the world's your programmable oyster.
Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.