Much has been written about the promise of mashups to become serious business tools — as well as the obstacles and challenges they must overcome along the way. It’s only now, more than six years since the notion of mashups first came to the fore (they acquired the name a little later), that SaaS vendors and integrators are beginning to realize the full potential of the mashup for enterprise applications. As this first wave of commercial enterprise mashups comes to maturity, it is making clear once and for all the mashup’s seminal role as the disruptive motor at the heart of the on-demand model.