Does anyone have an API for Amazon EC2, S3 or SimpleDB?

I need to write an app to push content to hundreds of thousands
of users, connected to a bunch of servers. Think liveblogging.
You push a button and your post needs to be in front of eager
readers within a couple of seconds.

The client-facing interface is Flash sockets and HTTP.

I'm thinking of allocating up to 10k users per server so
clustering is a must. I haven't decided how to ago about it
but I'm wondering if it's time to resurrect Ensemble [1,2]!

Any advice or suggestions?

	Thanks, Joel

[1] http://caml.inria.fr/pub/old_caml_site/caml-list/0315.html
[2] http://dsl.cs.technion.ac.il/projects/Ensemble

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Mac hacker with a performance bent
http://linkedin.com/in/joelreymont