I'm aiming for 50 mounts so I am super willing to do a AQ raid!
Same for me, except I'm past 50 and aiming at 100; there's two more bug mounts in there for me (think I'm lacking the red and green ones, red being by far the rarest, it even has its own Feat of Strength for getting one, as we found out last time we were in there).
I'm also working on Brood of Nozdormu rep, since I'm partway through the "Scepter of the Shifting Sands" chain quest, and one more AQ40 run plus a little bit of messing around with another source of rep-gain I have will likely get me to Neutral with the Brood, which is what I need to get onto the stage where really cool stuff starts happening; I'm doing this partly because I've longed to do this chain since it was put into the game back when I had only one real character, way back at 60, and partly because I reckon it could be a great fun set of guild activities to do; special timed runs of Blackwing Lair, fighting the four Dragons of Nightmare, summoning and defeating special bosses like "Maws" the shark and "Eranikus, Tyrant of the Nightmare" (the -real- version of that end-boss of Sunken Temple), Dr Weavil (seriously), and others. All cool stuff, all rarely seen, and all easily within our grasp if I can get a bit more rep!
Oh, and finally... yeah, there's one or two bits of cool gear in AQ40 I'd love to get my hands on. There's an old 2H sword in there that looks pretty cool, and there's a trash-dropped trinket I really want... it's not exactly powerful or anything, but I have plans for it that could lead to much hilarity... *schemes*
Anyhoo, as has been mentioned in the thread already, there's a signup for AQ40 for Thursday, and we may well make a regular thing of it. We also have in the past run all the other old-world raids (we even ran Old Naxx before it was taken out), and will continue to do so in the future!