One of the most frequent questions asked on the community forum is how can I make my userControl act as a containerControl (panel) which allows me to add controls at design time. In V1.0 and V1.1 you had to write a lot if code to do this, but in Whidbey...

Mark Boulter (Technical Lead PM) Dot Net Client team explains the new features for Whidbey. He explains his definition of "smart" clients in the first half and then talks about his work here at Microsoft. Here's the complete interview Part1 Part2