This is an absolutely brilliant move. Trying to figure out pricing estimates often discourages me from launching more stuff on AWS. Knowing I can get a feel for it, for free, is a real game changer. This gives my projects a strong base to start with.
A few observations: - I wonder if you could create a new account for each of your projects (er.. startups) or if Amazon would frown on that. - They seem to be extremely generous with this offer, except for the Amazon S3 limits. 20,000 GETs? That's nothing for the kind of resources that S3 is best at hosting.