I'm currently in the middle of creating an interactive map of the world in XAML and quickly learning the limits of Blend.
I've also learned a lot about geography.
Did you know that there are *a lot* of islands in the world.
Including Blend's annoying habit of drawing a blue bounding box around an object.
When you're trying to group all the paths into a canvas of Indonesia, with its 17,000+ islands, the screen gets a bit cluttered with blue lines.
Thankfully, my source map didn't express all of Indonesia's islands, but it does have roughly 1200 paths.
This is case where I wish I could turn of the lines but keep the selection indicators. (View -> Show Handles is an all or nothing proposition.)
Eventually, I've had to split the world out into regions, as Blend would periodically freeze as it parsed and rendered the 20mb XAML file.
With everything broken out into continents, the largest XAML file is around 3mb and performance has gotten a lot better.
I sure wish there was some kind of integration with MapPoint and WPF. I mean MapPoint uses vector data.
There's got to be a way to do the conversion to XAML.