MSN Screen Saver
The beta is out for a few days now. I just tried it on XP x64 Edition and of course it works. What I like most: The option to add RSS feeds.
Here's a list of 3 that I would recommend for testing. The first 2 use the RSS feature of MSN Search.
https://search.msn.com/news/results.aspx?q=64-bit++Microsoft&FORMAT=RSS
https://search.msn.com/news/results.aspx?FORMAT=RSS&q=(xen+hypervisor)+OR+(Microsoft+virtualization)
https://blogs.msdn.com/volkerw