One of the PMO (premium member only) functions on GC is the ability to see who visited a cache page.
While this is only part of a cache that was also assigned as a PMO cache (visible only to paying members) by a PM it is kind of cool and occasionally useful.
I see a lot of visits to my own caches and it might be interesting to see exactly who is looking but not integral to the game.
I thought this might be a great function while exploring one of my own caches that was placed with the intent of protecting a desired location of an OCNA cache from the incursion of GC caches in the same spot. http://coord.info/GC5MKY8 and the protected http://www.opencaching.us/viewcache.php?cacheid=1842
It would be beneficial to both myself and the owner of the protected cache to see who clicked the link to the cache and / or eventually logged it.
I know this would not work for those that are not yet members but still....
Non members might be listed as a visit from "unknown" or "non-member" or their IP address while members could be listed by user name.
My guess is that this is above MrYucks expertise but as a long term desire for the site it might be a good addition to the "all the perks of a paid membership on the other site" mantra