I just did an interview on .NET rocks about cloud computing.
We covered a whole bunch of topics including:
what is cloud computing
comparing the various offering of Google, Force.com, Amazon, and Microsoft
the social and economic environment required for cloud computing
the implications for transactional computing and the relational model
the importance of price and SLA for Microsoft whose offerring is different from Amazon and Google
the need for rich clients even in the world of cloud computing.