amazon goes after the enterprise cloud

one of the major concerns about cloud computing for enterprises is data security.  it's thus a well accepted fact that amazon's cloud offerings would never be taken seriously by enterprise corporations, especially those subject to the yokes of sarbanes-oxley.  companies like eucalyptus systems, which offers software for enterprises to build out their own internal private clouds have benefitted from this requirement.  that doesn't mean that amazon can't try to win those potential customers over, however.  they've announced the ability for enterprises to create virtual private clouds (vpc) within ec2.  i have not read too deeply about the specifics of this offering, but it does not seem like there are any guarantees about how the data stored by any enterprise customers can be segrated from the rest of the cloud, and still be afforded the same quality of service provided to non-vpc clients.  the aws blog post for the announcement is here.