Azul said:
That's it in a nutshell, although there is a feat in Complete Warrior called Hold the Line at allows you an AoO against those who charge you. I think it may have originally been in Sword and Fist.
Hold the Line allows you an AoO against any opponent charging anyone else and is entering squares that you threaten - which can get nasty with a reach weapon and a close defensive formation as even those opponents that charge your buddies besides you get AoOs from you (after all Combat Reflexes is the prequisite feat )
"You may make an Attack of Opportunity against a charging opponent who enters an area you threaten. Your Attack of Opportunity happens immediately before the charge attack is resolved." (CW, page 100 )
It's an original Complete Warrior Feat, and thus technically available only in 3.5
And as for the initial question, Hypersmurf is absolutely correct in his quote (both on contents and table/footnote quoted ) - whatever the action, if you leave a threatened square, you usually provoke an attack of opportunity. Those actions that are exceptions have the specific conditions explicitly listed - such as 5' adjustment and the "withdrawal" action.
Actually I have no idea what sort of weed the player claiming "no AoOs when charging" is smoking, because the charge action never protected/s you from AoOs in the first place, it just lists that the charge action in and of itself does not provoke AoOs - and as one usually does not leave threatened squares while performing it, no AoOs are suffered. Once you do that, normal AoO rules for movement into, through and out of threatened squares apply.