Hi Steffen,
Thank you for the kind words! WireframeSketcher is still a young product and it's updated on the constant basis. Hopefully it will much your expectations in the some near feature.
I already have the linking feature on my list. I'm still brainstorming the details but it's certainly something I'm planning to add.
Could you describe in more details what an HTML export should produce? Do you expect all the widgets to be replaced by their HTML equivalent?
I see the HTML export as a particular case of a more general "code generation" support. It's something that I'm hesitant to add because sometimes things just don't map that clearly to code/HTML. After all what WireframeSketcher does is half modeling and half drawing. It's the drawing part that doesn't transpose very well.
