All pretty good advice given .... EH over other stats after def min.
I prefer bukkit's deep wound spec when starting out but glyph differently mainly because I am always worried about threat when undergeared you usually have some fairly hard hitting dps behind you in heroics.
I used to set my baby tank up like
Talent Calculator - World of Warcraft
it is setup to generate threat via
You can debate whether to squeeze the glyph of blocking in exchange for revenge or devastate .. diff situations have merits.
The big diff is I in AOE tanking I am not expecting to be able to hold off mobs with cleave ... infact I dont even have it on my normal keys it banished to a remote location in my toolbar.
If you are tanking for dps around your sort of level cleave will work if the dps outgears your forget it nothing short of tabbing and using one of your high threat moves will lock them.
Hence you will get a sort of seperation between those who cleave and those who don't when AOE tanking. There is no right and wrong here it is just different the advantage of not using cleave is you can tank easily for much higher geared dps the downside is it takes a bit of practice.
** Remember Warcraft players fail in directions you never thought possible.