A while a go (September 2007), I asked some sales guy from Microsoft what the penetration rate of Siverlight was compared to Flash. I asked him in front of a large audience (a) because I was really interested, and (b) because I felt like being a bit of a smart-ass as I guessed it would be really really low. The sales guy seemed quite unimpressed by my question and refused to give me a straight answer, but he had promised to give away a Microsoft prize for each question (I got a crappy ugly Silverlight hoodie, which I promptly returned to one of their marketing chicks).
Anyway, I just read an article that stated MS has released Silverlight 2 beta and that people are installing Silverlight,
And over the last several months Microsoft has seen an increase in the number of Silverlight downloads, Guthrie said, and users have been downloading Silverlight to the tune of 1.5 million downloads a day… In comparison, however, in a recent interview with Adobe Systems’ chief technology officer, Kevin Lynch, Lynch said Adobe’s Flash is downloaded up to 12 million times a day
I’m still unsure as to what percentage of browsers now run Silverlight, but does not yet seem to be making as much of an impact as good ol’ Flash.