Five years ago I made a decision that to win (read survive!) the company I was directing had to standardise on a technology platform. The hands down winner was salesforce.com. They were just transitioning from a SaaS provider to a PaaS provider and it was just what I, and the company, had been looking for.
I believe the majority of people still think of salesforce as an SFA company but they are so much more. With the recent Dreamforce 2013 carnival it would seem that they too are proud to finally be seen as such.