I was reading an interview of Gary Flake who works with MSN search. The following quote stood out to me:
Â However, there is an even richer class of algorithms that can only be efficiently built on a 64 bit system because you essentially have to have a significant part of the web stored close to a single CPU. So, 64 bit systems pave the way for entirely new forms of relevance that look at how pages relate to one another.
That is just cool.
Microsoft announced recently that in a few months they would reveal a new search engine that is better than Google. This looks like part of it.