I really want to do this quest chain before it disappears come Cataclysm.
Of course, it requires doing Blackwing Lair at least twice (and three times if you don't time it right on parallel quest chains), Molten Core once (plus one additional visit that doesn't require any boss kills) and Onyxia once. Blackwing Lair, since it can't be solo'd (the first boss, at any rate) and since cloaks are needed for Nefarion, will probably be the trickiest part. (Actually, it looks like there is a way to avoid the AoE shadowflame Nefarion casts upon landing. WoWWiki suggests that standing behind the throne as he lands permits you to avoid it. Clever.)
But the initial push to get to neutral with the Brood of Nozdormu (starting at 0/36000 hated) is probably the part that makes me least likely to get this done in time.