SaaS Appliances can deliver where the Cloud cannot
Ross Mayfield has an interesting post at on 'SaaS Appliances',
pre-configured and self-contained applications.
While they are also deployed on-premise, SaaS applicances promise lower TCO, quicker deployment and ease of managment than traditional solutions.
For customers wary of cloud for regulatory, security or whatever reason, they are a good alternative. You can read his full post at Enterprise Irregulars.