Well, during the weekend I added a small test to log how many visitors of my blog have installed the Silverlight [1] plug-in already.
55% don't have the plug-in installed, 32% are using Silverlight 1.1 alpha (because of different build numbers some are put in the yellow parts of the pie chart) and 13% the current beta of Silverlight 1.0. I know that my blog [2] is read more from developers as from common users, but I'm happy to see that it is available by nearly half of my visitors.