GC Detective 3.0 is the new version of Google Cash Detective. GCD is a keyword spy tool which allows you to see what your PPC competitors are up to. By doing so you get some insight into what may work and what may not and thus save money on testing.
This release was first announced as Reality PPC which included a series of 10 videos teaching by real live PPC campaigns, additional webinars, follow up videos with customer answers.
Since Reality PPC was included as part of GC Detective 3.0 there will also be updates and improvements to the service.