...and something I've REALLY enjoyed are these events called Arkfalls. Basically every once in a while a meteor thingy (or thingies) fall in a random place on the map, and the goal of the event varies from having to survive waves of mutants spawning near the meteor to having to kill a gigantic insectoid thing while a crapton of smaller insects keep spawning around.
It's really awesome when over a hundred players work to accomplish the same goal.
I'd really like to see something similar in ESO. Maybe even in Cyrodiil, where people of different factions would have to work together to beat some huge monster summoned by Molag Bal. Altough I'm not sure how that'd work.
Anyone else? Just me?