I think that timeline is a good idea, so here's ours:
11/20 Kael'thas down
11/20 Winterchill down
11/30 Anetheron down (attunements for all raidmembers stole a lot of time

)
12/07 Najentus & Supremus down
12/10 Akama down
01/07 Kaz'rogal down
01/15 Azgalor & Archimonde down
01/25 Gorefiend down
02/04 Bloodboil down
02/05 RoS down
02/11 Mother Sharaz down
02/19 Council down
03/10 Illidan down
we lost almost a month during december '07 because of winter- and christmas-holidays of most of our raidmembers and new years eve, had some trouble with hearts of darkness so we had to do it with greens to have the whole raid being capped and so on. some things did not work as intended, but the result counts.
illidan was just a headshot for our cripple-casters that can't kill parasites and pulled aggro in P2, and we kept cleaning hyjal summit every week to gear up.