Off-topic, but yesterday I researched the download and capture of (Microsoft) Silverlight streams, and found on this board a couple of threads of interest.
In summary,
I downloaded a beta application (.NET) that captures a Hungarian TV soapie (it's hard-coded into the app), which captured the thousands of fragments, then merged them into a MKV file that plays very well on WMP 12 and VLC (with Shark007 Codecs installed on my system).
Silverlight is used on (Australian)
Channel 9 - FixPlay - and I was interested in the series
The Day of The Triffids (classic sci-fi yarn).
The download speed was horrendously slow - 6 hours for a 43 minute episode. There are capture utilities that can get the Silverlight stream and save as WMV (or other formats) in just the running time, but I'm not sure if the slow download time was related to the server speed and my connection.
Silverlight will degrade the video served according to the conditions (providing the server end created the low-res chunks to stream), so capture may not have been a good option.
That is, if I had played the episode 'live' with or without capture, I may have got a poor-quality viewing (and saved video file) and it may have taken well over the 43 minutes running time, anyway.
I'll locate the FixPlay / Channel 9 thread and post this same info there, and also post some links here for those interested.
I just thought it might be of interest to the community.