Morgan Tocker has some EC2 benchmarks for MySQL. The performance doesn't stack up all that well. He says EC2 tends to be inconsistent, which makes sense on a shared machine.
It would be interesting to see a Xen VM in the mix for comparison. It may give clues as to how loaded up each Amazon Dom0 is.
I bet small instances perform better because the disks are on a raid (ie, more spindles). You need to manually raid the disks on large instances.
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