I've never sold ads before.
What would a reasonable price be for the top spot (468x100 banner in the top right of the header) on my forum?
Monthly: about 333,000 unique visitors / 535,000 visits / 22,600,000 page views
If banners are sold in rotation, is the price just scaled down accordingly?
Not showing the same banner all the time might actually produce more interest in the banners...