One of the PDC2008 items is a technical whitepaper that is published online and you can open that XPS document directly here.

Here is a blog post that describes 6 unique reasons why Windows Live Search can be preferred over Google or Yahoo!.

I especially like reason #6. Basically one can search based on weight or preference. Here is an example:

holiday destinations prefer:Japan

Another good reason is covered here and it has to do with rolling a Double-6.