Jonas Folleso has an article discussing the exciting possibility to use C# and .NET across the three major smart phone platforms: WP7, iOS and Android.
Source: Jonas Folleso's Blog
If you ask me 2010 was the year of the mobile app. Everyone was talking about them, from consumers around the lunch table, to CEOs in the boardrooms. It was like 1999 all over again; only this time it was not about building websites, but to have some kind of offering in one of the major mobile app stores. According to the analysts at IDG the huge interest in mobile apps is not just a fad. They expect download numbers to grow from 10.9 billion in 2010 to 76.9 billion in 2014. As a result app revenue will surpass $35 billion the same year. In short, mobile is going to play an important role for software developers over the next few years.