Get highlights from your webcam video. This application sends you an email when motion has been detected, which sure beats staring at a computer and waiting to see what Fido is doing while you're at work.

Comment on any website without needing the author's permission. Kutano is a Twitter app that sits alongside the web page you're viewing, allowing you to start and respond to discussions about that page.

Still trying to figure out what Twitter does for businesses? Looking for case studies? It's all here.