Silverlight 3 includes a ton of new application development
The Silverlight 3 runtime/SDK combined with the Silverlight
Toolkit now includes ~100 UI controls that enable common scenarios (layout,
data, charting, child windows, etc) while also providing full styling and
template customization support.
Silverlight 3 enables richer data binding features.
Element to element binding support between controls is now enabled.
Validation error template support has been added to controls (enabling better
error message display). Hierarchical data binding is supported by the
DataGrid. And a new DataForm control enables better master/detail
scenarios. Silverlight 3 also now enables SaveFileDialog support.
Silverlight 3 includes a new navigation framework that
enables deep-linking and forward/back button integration within the
browser. This also enables search engine optimization (SEO) support so
that content within a Silverlight application can be indexed by search engines
– including Google, Bing and Yahoo. Silverlight 3 also supports the
ability to cache assemblies on the client, and re-use them across multiple
applications (decreasing the download size and improving the startup time of
Silverlight 3 includes much better text rendering and font
support. Text rendered using Silverlight 3 applications is much crisper
and cleaner than previous releases, and applications now have access to local
fonts. The Silverlight 3 styling system also now supports merged resource
dictionaries, BasedOn style inheritance support, and the ability for styles to
be reset any number of times. Silverlight 3 also adds richer
accessibility support, and is the first browser plug-in to provide access to
all system colors, allowing partially-sighted people to make changes such as
high contrast color schemes for ease of readability using familiar operating
Silverlight 3 includes richer networking support. WCF
error faults are now supported across the network. Server-side push
duplex support is now easier to setup. Binary XML serialization of
payloads is now supported. The new .NET RIA Services framework (which now
has a go-live license) can be used to easily build multi-tier data applications
that span the client and server. .NET RIA Services enables you to write
validation code once and have it applied on both the client and middle-tier
layers of your applications.