Great! I really hope you'll find it useful, even now when the expectation has been set quite high
I don't think we'll be at MIX, unfortunately, but it sure could be interesting. And if somebody out there would like to include the profiler in their presentation then they're more than welcome, and also welcome to contact us for more info.
no, BulkObservableCollection is not part the Silverlight standard libraries. Sorry for not making that clear. We've rolled our own and you can find implementations many places, e.g. here: http://blogs.microsoft.co.il/blogs/tamir/archive/2008/05/13/how-to-addrange-removerange-in-silverlight-observablecollection-lt-t-gt.aspx