I'll have to try the Zaino next time. The Mothers clay bar worked well and appears to be similar to the Meguiars product (clay bar using detailer liquid) that twobjshelbys described.
What about wax? I've had good luck with liquid wax (like NSX). Paste lasts, but it seems to promote swirl marks. In terms of maintenance, I use a spray detailer or Wet Paint.
http://www.wetpaintglaze.com/index.html