Such good advice, though it sounds like everyone is preparing for some epic battle. I suppose it certainly can be. I've been in the pit at many shows and as long as I was right on the barrier have done fairly well minus a few bruises here and there, and I'm pretty small. Put me back a few rows ... not so well. Sometimes it just depends on the show and that crowd. At Alice in Chains at Vegas Jen & I stood dead center about 10 rows back and we were fine, quite a bit of space until there was a little surge and some asshat spilled part of his beer on me about 3/4 of the way through the show. You'd think if he was that determined to bring his drink into the pit he would have drank it by that time, geez. For Muse we were in front of Chris and aside from an interesting few behind us things actually stayed relatively decent. Both my forearms are bruised though, but that was just from being pushed into the barrier itself.
Worst pit I've been in by far is Flogging Molly, and that was definitely due to the mass intake of alcohol by the crowd. Still fun though. I also think festival type shows often draw the worst crowds b/c people have been hanging out drinking all day.
Btw, people still throw bottles (or anything for that matter?) Unfortunate. There was an opener at one show called the Creepy Creeps that was unloved by the crowd (may have been that FM show?) Frontman dressed as mariachi played every song on a coffin shaped keyboard set to organ, and even then nobody chucked anything at him, though they possibly should have.