Preliminary analysis of the data for Nemertes forthcoming Security and Information Protection benchmark shows that approximately 63% of participants want to deploy (or more broadly deploy) technologies that they felt they could not, for security reasons. Of those, half named wireless as the technology in question, and over a quarter named collaborative tools, especially IM.
Reasons varied, but generally boiled down to lack of staff time to devote to the issue -- getting the tools in production or expanding their coverage beyond tightly constrained deployments was not important enough to be a priority, and the potential security issues were such that they could not simply be run up on a best-effort basis.