Great post by eddy; very well stated.
I don't always use glutamine, but here's an interesting reason to think about using it, too -- keeping the ph balance of your body in line. Proteins are going to be highly acidic and vegetables and fruits are more basic. What do us bodybuilders eat a ton of? Protein. Hopefully we get plenty of fruits and vegetables, too, but if not, this is another way to help shift things back toward a balanced ph. That's obviously not the only reason to take glutamine, but it helps.
Some glutamine power chews are a great way for me to have a snack, aid a bit in recovery and also help shift my ph balance back in check with the ridiculous amount of protein I eat in relation to everything else.