Sakura-chan has released a short but very impressive video of the MH-60L she is working on. Especially check out the articulated blades and gunner animations.
I've been working on an old mod of mine: It has a few 'new to arma' features, like articulated blades that simulate on deck idling and blade load. Blades change angles with vertical climb or decent to (primitively) simulate collective. The turrets have animated gunners that move with the gun. Its all a work in progress, but I still want to integrate some kind of fastroping into it.