- TweetCongress.org: A grassroots effort to engage Congress on Twitter. Users can find their reps, see who is tweeting, and lobby them to join the Twitterverse. Built with the Twitter and Sunlight Labs APIs. As they say, "We the Tweeple...". More at our TweetCongress profile.
- SemantalyzR: A tool for analyzing web pages for keywords. Use its page analysis to find keyword links to custom search results pages that search multiple services at once for that keyword. A mashup of many interesting APIs: ClearForest Semantic Web Services1 + Dooblet + Flickr + Google Ajax Search + Thumbalizr + Twitter + Wikipedia + Yahoo Term Extraction. More at our SemantalyzR profile.