Some information on Unity to get going:
- Introduction to Unity
- Downloading Unity
- Unity and Silverlight
- Using Unity and the ASP.NET MVC Preview 2
There are certainly a good number of Dependency Injection contains for .NET which have either been around for a long time or have sprung up recently. I am planning a post covering them in a bit of detail for those interested in learning about DI containers or understanding what is available.