I'm sorry but I do have to flame El Reg on this story.
Just a quick Google of the search terms Amazon EC2 IBM
Where DB2 and Informix have been on the cloud since 2009, what's really new with Oracle joining the fray?
Here's the complete list of relational databases:
and still here's a PR piece from 2008 about Oracle on EC2
So I have to ask... what's really new?