Quick Tips:

For those of you who are developing/designing using Blend 2 Aug Preview and Orcas B2 (Visual Studio 2008 B2) getting errors as such:

1. The name “Canvas” does not exist in the namespace
2. The name “TextBlock” does not exist in the namespace

You need to upgrade your Blend version from http://www.microsoft.com/expression/products/download.aspx?key=blend2preview

Cheers!