Changes Across All Search Engines

Unless you've had your head in the sand, there have been some dramatic changes in the 3 majors:

• MSN-Major Algorithm change and platform update; expansion of index from 5 Bill to 20 Bill. pages.
• Yahoo-Algo update, interface update, and the introduction of universal search, pushing their own properties
  
• Google-Major shifts on single word queries, indexed pages, huge diecrepencies between their test engine and Google.com, and weird things going on at specific Data Centers.

Overall, everything seems for the better. Aaron Wall of SEOBook gives a good overview as well.