What tool do you miss more for WPF development?

In my previous question we have gathered a list of useful WPF tools.

Today my question is what tool do you miss more?

Personally I miss a WPF designer for programmer.

I want to concentrate on writing code, so I need a good XAML editor with intellisense
support not a fancy forms editor.

Take a look at Paul Stovell’s article “Thought: Evolution of the WPF designer”

Another problem in my opinion is XML.

I don’t get any fun writing countless angle brackets.

I prefer to have python-like syntax for XAML.

So, what do think? Which tool can improve your productivity?

From stackoverflow aku

• Have you tried Microsoft Expression Blend?

  http://www.microsoft.com/expression/products/Overview.aspx?key=blend

  It's got good XAML + drag & drop support for design. It integrates with Visual Studio and if you really need intellisense when editing XAML there is a plugin for it.

  http://blogs.telerik.com/StefanDobrev/Posts/08-08-04/IntelliSense_for_Expression_Blend.aspx

  From Mark Ingram

• @Mark Ingram you misunderstood my point. I don't need huge UI designer, what I'm looking for is a XAML editor (and Cider definitely is not a good tool). I don't want to switch between 2 huge apps (MSVS & Blend) to create form layout markup or setup data binding.

  From aku