The BBC has been using Microsoft technologies for widgets that are used by "hundreds of thousands of users". And they have just publicly stated [1] that they have dumped the Microsoft solution for an Adobe AIR one. paidContent has posted [2] details, too.
Original Post: BBC Dumps Microsoft For Adobe AIR. [3]
Links:
[1] http://www.bbc.co.uk/blogs/bbcinternet/2008/07/free_range_widgets.html
[2] http://www.paidcontent.co.uk/entry/419-bbc-drops-microsoft-backed-skinkers-apps-switches-to-adobe/
[3] http://www.forta.com/blog/index.cfm/2008/7/2/BBC-Dumps-Microsoft-For-Adobe-AIR