The Loop -

Matt Fayle and Pip Jamieson are the brains behind The Loop (www.theloop.com.au), an Australian networking & portfolio site for creative professionals. The Loop is a market-tailored alternative to existing international networking and employment sites, that has quickly cemented itself as a fantastic platform for creatives to connect with like-minded professionals and with industry.
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Situation Interactive - First twitter performance -
This is probably a bit old now, but I just saw it. They’ve been nominated on the webby awards in the best Social Media category
Square - accept payments on your iPhone -
The much-touted card-to-card payments service from Twitter’s founder. The Square team is focused on bringing immediacy, transparency, and approachability to the world of payments: an inherently social interaction each of us participates in daily.
Square is rolling out apps for other devices including the iPhone, iPod touch, Android, desktop and laptop computers.
This is a major breakthrough for small businesses. You can create shelves with images of your products and services, there is no cost for the mobile card reader and no monthly fees. The system even accepts tips!
Download Square today from the App Store.