In his Tweening Equations for Silverlight post, Adam Kinney demonstrates how to make dynamic animations based on maths equations. Adam also endeavored to add links to the used external libraries and other relatet to the topic places.
Tim Heuer announcing that Silverlight Streaming is updated to Beta 2. Tim also reported that Joel Neubeck submitted their Silverlight 2 - Video player as an opens source project hosted at CodePlex.
If you need to obtain browser screen information like client width and height, you might find Jeff Wilcox post very useful. He provides static class that abstracts out the Firefox/Safari and Internet Explorer property differences.
Where is the WatermarkedTextBox in Beta 2? Find the answer in Kathy Kam post here. She also gives a link to the WatermarkedTextBox source code with unit test, that you can use for now.
Want to play some games - check the Vector Space: Zero Silverlight game. Daniel "Dan Dan" Gimenez did an amazing job on this game with parallax background scrolling, retro vector graphics, background music, sound effects and high scores.
Talking about cool stuff check out the Silverlight soft-body physics demo based on Walaber's JelloPhysics library. Click here and enjoy!
How to consume WCF or Webservice from Vista Sidebar gadget by using Silverlight is another great sample made by Tamir Khason. You might find interesting the James Bacon's post on Using Silverlight for efficient low level communications (UDP socket usage and port restrictions) .