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arc90 is a firm focused on building innovative web applications for clients, as well as their own products. One of their products is Kindling, a web-based idea management and collaboration tool.
Readability is a free reading platform that allows a user to either clean up a page for easy reading immediately, or save a page for reading later via a suite of apps.
Readability’s API is also a heavily used service, allowing third parties to determine the primary content of human interest on a web page. Tweetbot, Twitteriffic and Reeder are a few services that use Readability’s API.
TBUZZ is a bookmarklet-based Twitter web application. Users who install the bookmarklet can easily tweet any page they are on as well as see other tweets about the page.
Above: TBUZZ Screenshot -- #1
SFX Buys Readability Developer Arc90, Fame House and Tunezy To Give Its Electronic Dance Music Business A Digital Content Spin (techcrunch.com) 
Kindling Raises $2.3 Million Series B for Idea Management Platform (pandodaily.com)