There is a great book out by Mark Seemann called Dependency Injection In .Net. The latter half of the book covers 6 popular frameworks in enough detail to get a feel for them. It's worth a look to help a new person decide. He also covers poor man's dependency injection for those not ready to try a container, but want to at least write their application in a manner that can easily be converted to use an IoC container.
The containers he covers are:
- Castle Windsor
- StructureMap
- Spring.Net
- Autofac
- Unity
- MEF (though I believe he says that MEF isn't exactly an IoC container)
