Heres a very good tool the 64 [new] data centres are the one to watch for the future http://www.mcdar.net/dance/index.php
Yep... it's a nice one. The best Google Dance tool out there these days in my opinion (if there really is such a thing as "google dance" anymore). - Shawn
i experience some "google dance" some pages in top 10 fully droping out an d a few days again back in normal .. also when comparing ALL datacenters SOME times and for a FEW keywords only there is a difference of ranks like +/- 3-5 however most keywords from the 300+ watching these days are very stable every day with changes occuring only after i have made changes on the page
a good site to check all google datacenters is: verify google pagerank. It also verify the pagerank, to see if it's false or real!