Here's something rather interesting... the developers on the Mono team "hacked" Silverlight and it only took them 21 days to do it. They are calling their own product "Moonlight", which I have to admit is a much cooler product name than Silverlight.
Project details as well as some internal information including a bit of information about Silverlight internals are are the link below. Even if you care nothing about Mono or Moonlight, if you have any interest in Silverlight at all you should check it out simply for that.
This is actually really cool as it should seriously help promote Silverlight as a de facto standard worldwide, but I doubt anyone will be making a documentary called "21 Days" any time soon.