Pricing

• S3 is really quite cheap; $0.20 per GB of data transferred, plus $0.15 per GB-Month of storage used

• • (That's a good price for bandwidth, as far as I know)
  • There are better deals around, but this has other features...

• EC2: a bit pricier: $0.10 per instance-hour used

• • plus $0.20 per GB of data transferred outside Amazon; but traffic to/from S3 is free