found this on the Amazon forums (mostly leached from the post)

Current data transfer price (through April 30, 2008)
$0.100 per GB – data transfer in
$0.180 per GB – first 10 TB / month data transfer out
$0.160 per GB – next 40 TB / month data transfer out
$0.130 per GB – data transfer out / month over 50 TB

Data transfer "in" and "out" refers to transfer into and out of the Amazon service. Data transferred between Amazon EC2 and Amazon S3-US, Amazon SimpleDB and Amazon SQS is free of charge (i.e., $0.00 per GB). Data transferred between Amazon EC2 and Amazon S3-Europe will be charged at regular rates.

New data transfer price (effective May 1, 2008)
$0.100 per GB – data transfer in
$0.170 per GB – first 10 TB / month data transfer out
$0.130 per GB – next 40 TB / month data transfer out
$0.110 per GB – next 100 TB / month data transfer out
$0.100 per GB – data transfer out / month over 150 TB

Data transfer "in" and "out" refers to transfer into and out of the Amazon service. Data transferred between Amazon EC2 and Amazon S3-US, Amazon SimpleDB and Amazon SQS is free of charge (i.e., $0.00 per GB). Data transferred between Amazon EC2 and Amazon S3-Europe will be charged at regular rates.

Thats cool. always nice to see the price of Bandwidth drop!