With our QueryableCollectionView you have built-in support for filtering, grouping, sorting, aggregates and many more not supported in plain ObservableCollection. Furthermore the collection is ICollectionView (currency support), IEditableCollectionView (edit/update/cancel), IPagedCollectionView (paging) and the biggest advantage - IQueryable. If you provide IQueryable for QueryableCollectionView all operations will be executed directly on your data-base server using the query provider. Of course in Silverlight this is not verry common case (you have very few options for real IQueryable) however in WPF this can be very convenient.
the Telerik team
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