On the EU forums, a character named Redbranch from Thunderhorn came up with what I thought was a pretty nifty idea -- getting his/her fellow players to chime in on a list of 101 things to do in old Azeroth before Cataclysm hits. It's sort of the WoW equivalent of The Bucket List, and the responses range from the violent ("Slaying as many people as possible") to the nostalgic ("Go base jumping again in Feralas") to the practical ("Prepare plentiful supplies of gold").
Then Slorkuz chimed in with the following:
We already know that Thousand Needles is going to be mostly underwater in Cataclysm, but it was another nudge to the realization that the world we know is going bye-bye forever. Right now, my personal "bucket list" includes doing the dungeon set 2 quest line, but I'd love to hear from other players on how they're approaching the "end of the world."