breny - 5:00 pm on Feb 1, 2007 (gmt 0)

There have been improvements in the AdCenter interface over the past year or so. They're slowly making progress. Are you using the regular interface [URL]https://adcenter.microsoft.com[/URL] or the new beta [URL]https://beta.adcenter.microsoft.com[/URL] interface? I'm finding the beta a bit easier to use.

As far as traffic goes, even though my traffic is lower with AdCenter than Google, I get very good ROI.

Are you using all three match types on your keywords? Have all your keywords been approved or are there some that are pending?

I highly recommend calling their support if you have concerns. They are very eager to help and their response and followup has improved greatly in the last 6 months. They may be able to give you some insight.