I haven't had time to do any challenging solo stuff on my hunter lately, since I've been spending some time on a lowbie priest duoing with a friend who decided to try WoW out.
I've definitely been missing the excitement of dying endlessly while working out how to do stuff though, so I've decided to give a quick update on other hunters that have been having fun:
Dysphoria and Haiatu I've mentioned before, but two other hunters that have been posting their soloing exploits more recently are Skhope of Icecrown (going by the name chanc6) and Tribunalx of Whisperwind (TribunalXHunter).
Skhope covers Attumen, Ahune, and various bosses of ZG and MC, whilst the more interesting vids of Tribunalx include soloing AQ40 trash for mount drops and normal Nexus (the majority of his vids actually cover a broad range of hunter topics unrelated to soloing, as he has his own general hunter blog).
Hopefully I'll get some time to kill these bosses myself at some point - I always make it harder for myself by being lazy and not respeccing out of my general raiding BM spec to buff the tanking potential of my pet, but I'm sure I can do it - Attumen is definitely one I want to try, since it'd be fairly quick to farm for the mount!