Resources on SL are scattered all over the place on the internet. Of course www.silverlight.net is a good resource. For me to really see what is going on, spending time inside of "Reflector" to see how SL works internally is a must.
That is why I decided to write the book, to show from a practical point of view how to develop in SL especially LOB applications.
Also Telerik is doing a great job in releasing sample applications for Silverlight that can help a lot in understanding and using the technology, that is why I added my voice to this thread as the Telerik Dashboard example looks very nice and I am sure a lot of people would like to see the code for this to learn from.
SL is huge and going to be even bigger, have fun!