This is a free set of tools built upon the Google Base API, which will give users everything from a valuable insight into competitors listings and prices to stats, like pageviews, impressions and clicks, on their own items listed on Google Base.
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YES for eBay
Building a sentiment analyser for your Twitter feed
Intro to Google Charts and gchartrb
Real Estate Listings with Google Base
PHP Wrapper for Google Chart API
Ruby Wrapper for Google Charts API
APIs, mashups and code. Because the world's your programmable oyster.
Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.