Didnt really touch on Expressions, Silverlight is cool but is is aiming to replace flash which I think will be a very hard target as flash is everywhere, the de facto standard.
while it might be hard to beat flash now, considering this is being pushed very hard by MS, there will be a time when this will surely be accepted at sometime.
afaik, MS are going full steam with this.
and its been very quiet from the developers end on this product..