These controls are interesting - at this point, I've only had a chance to play with the demos that have been posted and they're cool but it had me wondering how the controls are designed.

Given that Silverlight is about richness on the web, there would be a real need to be able to combine controls like these with alternate styling so I wonder they handle this.

WPF handles this with templates which also combine really nicely with data binding (e.g. databinding a listbox and then using item templates works really well).

I wonder how that works here - it'll be interesting to find out.