If you have some un-filled banner inventory, take a look at these programs to help bring in some additional income. Some are pay-per-click, and some pay based on the number of impressions for their banners.
WordTracker - Find Keywords the easy way
Optimizing keywords for search engines has just been made simple. Keywords for Pay-Per-Click advertising the painless way! Word Tracker reports give you a clear picture of the most productive keywords to target with the least competition. Word Tracker lists up to 500 words or phrases depending on keyword searched. There are 3 types of detailed reports available. A two-tier affiliate program paying 15% for any sale made through you and 5% for sub-affiliates.