I recently wrote that the rate of disruption was accelerating not just around mature, "utility" technology areas but in newer, innovation tech areas such telepresence and mobile devices.
Add SaaS to that. Earlier in week salesforce.com and Google announced a partnership around their SaaS CRM and office productivity applications.
2 days later Zoho announces its own enterprise version of CRM, to go along with their own office productivity suite.
Their disruption - pricing at $ 25 a user a month.
And as I have written before Zoho is a company which is unbelievably productive in its development and one which spends way more in R&D than in marketing. That is certainly a disruption in the software industry.