I forget to mention I work in a .net environment and I've also built a startup (http://whatsyour20.com http://whatsyour20.com) using asp.net. Unless you really

I forget to mention I work in a .net environment and I've also built a startup (http://whatsyour20.com http://whatsyour20.com) using asp.net. Unless you really need the features slow down and evaluate your need for silverlight. Do you need it or do you want to use the new shiny stuff? I don't even use the asp.net ajax framework, instead preferring jquery for my ajaxxy stuff. Asp.net can be a great tool but I can't really comment on silverlight as I've yet to find a real need for it.