Google have been working on Map Reduce for 4 years longer than anyone else. I'm actually pretty happy that we (Yahoo!) are talking about what we are doing in t

Google have been working on Map Reduce for 4 years longer than anyone else. I'm actually pretty happy that we (Yahoo!) are talking about what we are doing in the Open and contributing in an Open project. You could reproduce what we did. Obviously you can't reproduce what Google did. What's more useful?