I have Adlogger, a simple PHP&MySQL script, which logs clicks on ads and after an X number of clicks from the same IP it shows an alternate ad or nothing. The scripts also logs unique page views.
What I wish:
Tagging all visitors with a permanent cookie and registering this cookie and the user IP into the database (IP registering already done).
After an X(setable) number of page views from the same user -identified by cookie or IP - display an alternate ad or nothing(user selectable).
That would be it. Please bid only if you can do it. If everything done right you'll receive an excellent rating.