Karl Shifflett recently released the latest update to XAML Power Toys.  This is a great VS add-in that makes WPF/Silverlight development much easier and faster.  His blog has a great breakdown of all the features, including a few Silverlight tutorials covering some of the major features.

I came across this great post this morning on Stephen Walther's blog.  He talks about some tips and tricks that you may not know about in Visual Studio.  I've been using a few of these, but there are some here I am glad to know about.