Which one do you think holds the most potential for future applications?

I found a pretty neat app at the British Library website

Currently it only has 16 books, but its pretty cool to mess around with.

The original one was done in flash, and can hardly hold a candle to the beta of the silverlight edition.

The only drawback I have seen so far, is that the silverlight version uses anywhere between 200 and 300 MB of ram when running. I hope they optimize the site, but it is using pretty high resolution images, so I guess that has something to do with the memory usage...

Flash Version
http://www.bl.uk/onlinegallery/ttp/ttpbooks.html

New Silverlight Version
http://ttpdownload.bl.uk/browserapp.xbap