We found a cool (open source) program the other day.
It looks really good but I'm only now learning it.

phpAdsNew

Looks you can can rotate depending on day, time, content, ....
And you have stats for you and you can setup login for others if you sell space on your site.

Speaking of selling space...

If you have a good traffic site and have space for lease let me know.
We have a few VOD sites that we want to promote.

Steven