Paul, VP9KF (W4/G4BKI) has posted on his blog that the 'DX Code of Conduct' initiative appears to have drifted away from the originators of the concept, FOC
Either way, the DX Code of Conduct website which Paul is a little disparaging about DOES take the DX Code of Conduct to a new level and invites amateurs to sign up to it. If you sign up to it, your callsign is displayed as a mark of your commitment to reducing the level of poor behaviour on the DX bands.
Paul's right - there are a few technical issues with the site - which I am sure can be resolved really quickly, but the intent and concept is great. It's good to see the idea being developed and moved forward.
You can sign up and demonstrate your commitment here