Silverlight 2.0 might be all the fashion but 1.0 is released and out there, so there is value in using it purely for the wider reach and acceptance of users who are happier to install the released plugin.
So here is a easy little app you can write your self to give you an image rotator with click through and whatever logic you want for the weighting of the images.
It fits together as follows:
A Silverlight Xaml page with some JavaScript to control it
An Asp.Net web page with the Script manager from the...