Once again, I’ve been assuming that everyone in the WPF community already knows what I know. Funny thing is, I haven’t seen heavy coverage for Woodstock and Mole. Put simply, if you are developing in WPF, you owe it yourself to go right now and download Mole. For a little background, Mole is the successor of Woodstock, which is the spiritual successor to Snoop. For an understanding of Snoop, think UISpy or Spy++ for WPF. Now take Snoop and turn it into a Visual Studio debugger visualizer so you can drill into your visual tree on a breakpoint, and you have Woodstock.
Now take Woodstock and put it on steroids, and you have Mole. Like I said, you owe it to yourself to get it NOW.