File this one at the front of the stack.
I recently mentioned to an EVP client an online tool called BlueSteps—a service of the Association of Executive Search Consultants (AESC). I haven't been a paid user, myself, so I haven't had visibility into how it works.
Then this morning, I stumbled upon Boyden Global Executive Search's "Candidate Resources" page, and voila! The left sidebar has a great list of BlueSteps member benefits, top among them being the most critical piece: confidentiality.
If you've used BlueSteps, I'd be interested to know offline about your experience. You can reach my office at email@example.com.
Meanwhile, the page contains additional tips for executive job seekers.