Great Snippets: Great code snippets I have installed into my Visual Studio for WPF development are the Dr Wpf and Nerd+Art snippet packs.

WPF Coding Conventions: The coding guidelines I use for WPF are a riff on Paul Stovell’s XAML and WPF Coding Guidelines.

Application Quality Guide: There’s a WPF Application Quality Guide in the works. More information at WindowsClient.net.

Avalon Healthcare Demo: Still my favourite WPF Line-of-Business App Demo. Code available here.

Prism: Think CAB (or SCSF) for WPF, re-built from the ground up to learn from past Composite UI frameworks. There are drops available on Codeplex. Brian Noyes, a contributor, has a great summary here.

WPF/Silverlight shared code: Someone asked about sharing code between WPF and Silverlight. While I think it’s more skills than code that you’ll actually be sharing, here’s a good example in Delay’s blog of actual code being re-used bewteen the two frameworks.

hope that helps,
Rob