Some time ago I've received a copy of the book "Microsoft Silverlight 4 Data and Services Cookbook" and finally I was able to read it during my recent holidays. So I decided to write this brief review to suggest you to give it a chance, because I found this book is really interesting for someone need to start learning Silverlight 4.0.
The book is a sort of collection of recipes, that describes some use cases of Silverlight applications that give a good framing for various aspect of this technology.
The ten chapters cover all the basic arguments someone may need to start writing applications, from the first project and the use of Blend, to more advanced topics like databinding, the data controls and the usage of WCF Service and Ria services.
I think the people usually ask me about good books to start from, may found this cookbook useful for this purpose.