At the moment Symbian is the biggest smart phone platform out there. It is bigger than iPhone, Android or Windows Mobile! And now you can start developing Silverlight webrowser appliactions for it with .NET C#!

Microsoft released Silverlight for Symbian - Beta. If you are a .NET developer all you need to do is download

Getting started document 

Microsoft® Silverlight™ 2 Tools for Visual Studio 2008 SP1 

Silverlight for Symbian

Silverlight for Symbian.sis - Update 07/July/2010: yOu can now download Silverlight from symbian from Ovi Store too.

All Nokia S60 5th Edition devices are supported, including the:

· Nokia 5800 XpressMusic

· Nokia N97

· Nokia N97 Mini

· S60 5th Edition SDK v1.0 Emulator

The following Silverlight 2 features and technologies are not supported in this release:

· Cryptography

· Deep Zoom

· DLR

· Digital Rights Management (DRM)

· Expression trees

· HTML DOM bridge

· JavaScript programmability

· LINQ to SQL

· Localization of Silverlight resources

· Reflection

· Sockets

· Visual Basic

· Windows Communication Foundation (WCF)

Skype released Symbian version of their voip/video chat software. Symbian is operating system of most of the Nokia smartphones and have a very big market share. If you have a Nokia phone with Ovi store installed you can check it from there to see if you can download it. I personally use Skype to make cheap international calls from my mobile phone and as it explained official video below it could save you quite a bit of money.

More at Nokia press release