DevExpress present their Silverlight Layout Control. It provides the user with a lot of possibilities for arrangement and rearrangement of the items inside it. You can also see a live demo on the "Area51" web site.
Laurence Moroney have posted a table of contents for the "Introducing Silverlight 2" book. Bonus chapters on Visual State Manager, Building a great Install UX, Enhanced Networking including Sockets programming and more are also coming soon.
Alex Golesh wrote an article in which he briefly shows what be done using Silverlight and Streaming Media. In the next post Alex gives some light about the "InitializeError #2103 - Invalid or malformed application". If you have had problem with that error, don't hesitate to take look.
Mark Monster wrote another article about Silverlight Networking - Getting credentials to work, a new WebRequest. If you have missed the previous two here they are: Silverlight Networking - Getting credentials to work, unsuccessful and Silverlight Networking - Getting credentials to work, a possible work-around?.
Don't miss this cool article about animations in Silverlight from Richard Griffin called "Silverlight Tweening Adventures with Baby Smash!".
What about Silverlight and the Multi touch tablets? Bart Czernicki shares his thoughts about that.
If you are interested in creating a Silverlight application as a designer, this article about Building A Silverlight Application: A Designer's Perspective can be useful to you, actually it doesn't matter if you're designer or not, the article is really worth reading.