Advantage SaaS: Faster Go-live!

I am increasingly convinced that a number of big changes are happening that are likely to reshape the way businesses use technology, including cloud computing, SaaS, and the increasing ability to really compose solutions from services (think SOA that works across technologies).  I believe dollars and hours are going to be the drivers of these changes, rather than pure technical considerations, and want to do a few posts to share some of the reasons.  I'll start with a key SaaS virtue, which I actually believe if more a factor of the "service model" than SaaS -- rapid implementation.