Symbian led off its Mobile World Congress introductions today with the first full appearance of Symbian^3. The newly open-sourced OS has many of the features shown in previews, including multi-touch, single-tap actions where possible, and multiple home screens with widgets. A unique highlight, however, is a visual multitasking system: users can bring up a view of active app windows and choose to switch to or close those apps without leaving the existing view.
