Google is moving it's collaborative office tools towards being able to handle "secure data." See related article.
While we haven't seen any actualy security reports on this functionality, it could not only solve problems for many corporations but also for many scholars looking to do collaborative research but while in an environment which meets strict confidentiality rules required by international review boards and other institutional practices. Currently, we use one remote secure data provider, the University of Chicago NORC Data Enclave
, to provide remote, secure use of research data to a community of scholars for the Kauffman Firm Survey