It is a bit off topic for Access developers but I found this article a great read. I especially liked the discussion about long tail apps and plan to blog more on the topic in the future.

Summary: This provides an overview of the software-as-a-service (SaaS) model for software delivery, provides a high-level description of the architecture of a SaaS application, and discusses the challenges and benefits of developing and offering SaaS. (26 printed pages)

http://msdn2.microsoft.com/en-us/library/aa479069.aspx