Yeah, just throwing stuff out there. One other technique that springs to mind: 5) Set a minimum number of views or clicks a link must get before "falling off.

Yeah, just throwing stuff out there. One other technique that springs to mind: 5) Set a minimum number of views or clicks a link must get before "falling off." So, if a ton of links are submitted around the same time, sprinkle them back into the mix -- perhaps using a version of Technique 1 -- until they've hit the minimum, then let them die a happy death.