In one case, the ad's display URL was a domain that doesn't even exist. For several keywords, I also had an ad going to the same website (and mine had the correct display URL). The presence of the 'bad' ad was effectively reducing my CTR as well as increasing my CPC... So I phoned Google and the person I spoke to took the information and said she'd pass it along. Two weeks later, that ad is still running.
In another case, I've seen five separate ads on the first page of the search results, all them going to the same domain and each having a different display URL.
Isn't it relatively easy for Google to verify display URLs programatically when ads are submitted? Even if not, what's taking so long for them to get rid of the pollution in the ads that has been clearly identified?
I realize Google makes more money if they keep all of those ads, but I had figured they're not so greedy or incompetent.
[edited by: Rehan at 7:11 pm (utc) on Mar. 29, 2007]