RedHat has announced that they have enabled RedHat Enterprise Linux to run in the EC2 service. This comes at more of a cost than the normal price for EC2: $19 a month per user, plus 21, 53 and 91c per hour used (small, large and extra large). Amazon has a little more about it here. This is cool. this could mean that any vendor, including Microsoft (in theory since Windows can run on Xen), could enable this to work with their Operating system.