[sadga]

AWS Spot Instances are incredible. They make you a liquidity provider, and reward you for it.

Paying list price for any load that isn't mission-critical and needed immediately is insane.

[chaz]

Also, if you're looking for a longer-term commitment but want to get out of it, their Reserved Instances can now be bought and sold. Great for if your plans change and you want to recoup some of your costs.

http://aws.amazon.com/ec2/reserved-instances/marketplace/