stuff like
/cast !catform gets you in catform nomatter in what form you are, human, bear or whatever. if you're allready in cat it does nothing.

Same goes for attacks. On my feral, i don't have maul bound, since i want every melee attack to be a maul.
so i use these macro's
#showtooltip Swipe (bear)
/cast Swipe (Bear)
/cast !maul


#showtooltip Mangle (Bear)
/cast Mangle (Bear)
/cast !maul

etc.

and just nice:
#showtooltip
/cast Enrage
/cast Tiger's Fury