"Good advertising is whatever works for this audience today, good design is eternal."

Richard Huntingdon (big cheese planner for WPP) has written a fabulous post about the differences between advertising and design

It's very well written and unusually for blogs and for the marketing industry it's not just a ding dong. It just talks about the differences - not we're better than you etc etc. It's all rather intelligent.

You should take a look and then contribute.