Just read the DatAnywhere article and I'm of the mind that users should expect that this sort of tracking can take place, but lets get rid of the bullshit terms. The article says "It's not snitch and snoop: it's trust, but verify". I think that's bollocks - there is no trust in such a setup.
It's less offensive to be honest and tell your staff "sure we'd love to trust you, but we can't ...". And especially less offensive if the technology is applied to all users, regardless of position in the company.