There's tons of fun instances in DoD, and the loot that you get for beating those bosses is pretty complete.
This site has a complete listing of what Im' talking about:
http://samanna.net/gen.info/prog.dod.shtmlThere's a few slots my toons are still missing and I'm having a tough time figuring out where to go get them (earrings, rings, shoulders, sheilds). There is loot around, but it takes a ton of skill to complete a lot of these instances, they're so well designed I'm gonna miss them.