Which of the Google centers has freshest data?

[tomasz]

I am just curious which of the Google data centers has freshest data?

thanks

[Sharper]

The ones closest to your website via BGP.

Seriously, from what I've been able to determine, each data center spiders different URLs and adds to their own index, then it all gets merged at one of them (appears to change each month) and distributed out to the other data centers as the "new" index. ALl of my sites appear to get refreshed in the data center closest network-wise (using BGP routes) first, then merged into all of them later.