MonoTouch and MonoDroid are frameworks that allow you to write applications for the iPhone and Android in C #. After the appearance of Windows Phone 7 in C #, you can write directly under the three platforms. In this case, the interface remains native and does not suffer the speed of work. ')
From the video you will learn: - about these frameworks in general; - that MonoTouch compiles projects into native code; - and in Mono for Android, the CLR runs in parallel with the Java VM.
The technology is quite viable; over the year we have created more than 6 projects on it, two of them visited the top of the AppStore, in total more than 200 thousand installations. If you write in C # and live in St. Petersburg you can see this for yourself :)