Mike Gotta thinks that Salesforce’s Koral move (Apex Content) puts them in competition with Cisco that recently acquired WebEx:
At some point, Salesforce needed to respond to the productivity, content and collaboration platform Cisco can exploit given WebEx WebOffice and WebEx Connect.
I would add that Salesforce clearly moves to take a stance against other collaboration and content management players like e.g. Microsofts Sharepoint or Google (as Nick Carr notes), while it validates the increasing importance of “as a service”-offerings. Hence, its position in the SaaS-landscape is a hybrid one: While offerings like Google Apps are competitors in some ways, they are good competitors because they strengthen the SaaS-model as a whole, heck – they might even collaborate in expanding this market, and they will stay friends quite some time.