Dave wrote a thought-provoking post on online advertising and blogs following on from mine and Damien’s posts on the topic.

Dave’s idea is not to display ads to regular visitors to your site:

What I’d do personally is to have a cookie on my site so that repeat visitors didn’t get ads.

People who click on my ads stumble into here from Google so it’d be great if they were the only people who got the Ads.

Personally, I feel that the people who read my blog more often, consume more of my resources, so they should be the ones presented with the opportunity to thank me by clicking on an ad once in a while!

Go ahead, thank me, you know you want to! 😉

UPDATED:
Edited to add a 😉 so as not to violate the Google TOS – thanks Dave