As part of my job with Microsoft's Emerging Business Team I get to work with lots of innovative start-ups with cool technology. Dan'l Lewin wrote an Always On editorial Checked My List Twice highlighting some of those companies. I encourage you to read the entire article but here is a list of the companies mentioned;
We work with hundreds of new start-ups developing products on the Microsoft platform. These are a representative sample of the kinds of companies and products we like. If you have a new start-up building innovative products and services on Microsoft platforms we want to help you. Drop me an email (ddodge at microsoft dot com) and I will direct you to the right person.