As I feared, the close relationship between the British Library and Microsoft has led the former to start producing online exhibits locked into the latter's proprietary products:
Turning the Pages 2.0™ allows you to 'virtually' turn the pages of our most precious books. You can magnify details, read or listen to expert commentary on each page, and store or share your own notes.
Turning the Pages 2.0™ runs with Internet Explorer on Windows Vista or Windows XP SP2 with .NET Framework version 3, on a broadband connection. We have detected that you do not have the necessary software. You may also need to check that your hardware meets the 'Vista Premium Ready' specification.
So instead of opening up access to knowledge, the British Library is now foisting Microsoft's closed source on its visitors. A sad day for a once-great institution. (Via The Reg.)