you my friend, have come to the right place!
http://www.vimeo.com/1045255 <- Hydross
http://www.vimeo.com/1022308 <- Kazrogal
http://www.vimeo.com/1056678 <- Lady Vashj
I have made some more videos, but since the filefront page doesn´t load for me for some obscure reason anymore my webspace is somehow limited.
Have a look at these videos, and know that Felguard is certainly viable for raiding, BUT be aware that it is the hardest specc to master, since you both have to keep up a very tight spellrotation and take care of your felguard.
I always raided as 6/44/11 and it made most sense to me to raid specced like that.
You definitly want a shadowpriest in your group before you have 2 t5 pieces, and even after that a shadowpriest is nice to have.
As mentioned before, do not let your Felguard die!
So you must know both what you have to do during an encounter and what your felgaurd has to do, where he must be at certain times, and where you won´t want him to be.
Hard to manage, but so much m,ore fun than destro and affliction.