I've been playing with Microsoft Popfly and created two different mashups. The technology is pretty neat, but it has a long way to go before I see a lot of people using it. The biggest thing missing is useful blocks – I had a lot of trouble filtering data and keeping it in order to show correctly. It reminds me of my AI classes in LISP since the idea of passing list of data around is the key. Anyway check them out and let me know what you think.
And as far as what Silverlight can do – it's very impressive. This will be interesting to see what happens. But trying to use from my Powerbook in Firefox was not fun – it keep freaking out… Thanks -