These machines hold their promises, they are extremely fast, the networking between the instances in fast, as is their connection to the outside world. I'm eager to see what people do with these.
And the pricing... to quote from the other article[1] on the GPU instances that's on the front page right now:
"An 8 TeraFLOPS HPC cluster of GPU-enabled nodes will now only cost you about $17 per hour."
[1] http://www.allthingsdistributed.com/2010/11/cluster_gpu_inst...