City of Heroes (Before they changed this feature and killed it): Max level gear being droppable from any max level activity.
I am not really a raider, but I do like to min/max and I would appreciate being able to do so without being forced into an activity that I dislike. I think this would actually also encourage more people to raid because not only would you have an easier time getting the gear to help you participate, but it would take away the "You caused a wipe and lost me x piece of gear tonight so I am not allowing you to raid with me again" attitude which is what puts a lot of people off raiding in the first place.
Basically this would involve any level 50 enemy (Assuming 50 is the cap) having a chance to drop
any level 50 item, but an organised raid would give you a guaranteed amount of drops, so you could raid if you needed something specific, or wanted to gear up quickly, but if you never raided you wouldn't get left behind assuming you still played your max level character enough.
An addition which would make this better would be to have gear be statless (Aside from quality so Daedric &--#62; Steel) and have the boosts that you get based entirely on transferable items. IE: The raid drop is an enchantment that gives a weapon a certain property (Such as fire damage) which you can put on any item you own, rather than getting a fire sword. This way I could keep whichever weapon/armor I liked the look of, do whatever activity I enjoyed the most and still not feel like I am missing out on anything.