Persistent Ads (Score 5)

When I read print articles I notice ads and return to them later. The problem with web ads is that I must act now or lose my chance. What I would like is a hybrid dynamic/static ad system. The ad itself can be random, but once I've seen it, it should remain each time I return to a specific page. Thus I can remember I saw the ad for FooCorp Widgets on the Slashdot article about Ginger and track it down days, weeks, or months later.