MongoDB on AWS: a whitepaper from Amazon

I built my startup using this <i>exact</i> outlay, so it's wonderful to have this guide in hand for when we need to scale Mongo across multiple EC2 instances. This presentation from Jared Rosoff of 10gen was extremely helpful on the first go, and it's satisfying to see that the AWS paper corroborates the content.<p><a href="http://www.10gen.com/presentations/mongosf-2011/running-mongodb-cloud" rel="nofollow">http://www.10gen.com/presentations/mongosf-2011/running-mong...</a><p>Couldn't be happier with the performance so far.

How is the pricing for Mongo on EC2?<p>The absolute minimum would be single server w/ journaling running on a 64-bit instance. I am assuming the 64-bit micro is to IO bound, so the Large instance is the next minimum viable instance. At $0.34/hr, just in instance fees it's ~ $245 a month. Am I correct in assuming this is the entry level Mongo setup on EC2?

What's with the [scribd]? Shouldn't it be [pdf]? I know what scribd is, but why use it as a tag linking to a pdf? It's misleading as scribd used a flash applet, right?

I wish they'd just wrapped it up as elastic mongo like they did with mysql, oracle and memcache.