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Would have been more interesting to see the Dropbox data center, and get some insights into how they operate and scale it.

If Dropbox is still hosted on EC2 and S3, I guess there's not much hardware to see. :)

There are rumours they're moving away from Amazon, however: http://www.quora.com/Why-is-Dropbox-moving-away-from-EC2

Anyone has insights on this?

I believe they use Amazon S3 for all storage.

In fact, they're supposedly the single largest user of S3 by data stored.