Saas is a new, or maybe not so new buzz word. It stands for Software as a service. It's a web 2.0 rendition of ASP. Of course, there are new characteristics and subtleties attached, but concepts are pretty similar.
As always, wikipedia has the best definition
On-demand Software is a software that runs across the internet in a software as a service model (no software to install).
Service Oriented Architecture (SOA) aims to simplify integration and increase agility by creating well defined and standards-based boundaries between systems.
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