This is the third installment of our exclusive interview last week with Microsoft CEO Steve Ballmer . In the first article we showed an overview and video footage of the main subject areas we covered: Big Opportunities, Operating Systems/Browsers, Mobile, Search and Developers. In the second post we did a deeper dive on his thoughts on big business opportunities for Microsoft in the next 5 – 10 years.

Have you tried out this blind search tool yet? It provides results from Google, Yahoo and Bing in three columns but doesn’t tell you which column is which search engine.

Layar is one mobile application that has definitely managed to get quite some tongues rolling and keyboards rattling this past week, including at the Mobile 2.0 Europe conference in Spain where I just got back from (video demo below). Layar is a so-called ‘augmented reality browser’, an application that turns you mobile phone’s camera viewer - only on Android-powered phones for the time being - into a full-fledged information portal and local business search engine. It essentially puts an information overlay on top of your camera view, bringing digital data of various sorts into play whenever you’re looking at or for something in the real world

Twitter Search is easily the most promising aspect of Twitter.