I'm a new player hoping to get some clarity in regards to attacks of opportunity. For example, if I'm a druid grappling an enemy, once I have maintained my grapple and use my move action to walk (at half my speed) into the threat area of my allies attack would that set off an AOO from my allies?
There is some disagreement about that. My opinion is that forced movement does not provoke, but it is in many respects an inference and not strictly specified.
If your GM doesn't adopt/agree with that principle you'd probably fall foul of this rule:
If you attempt to place your foe in a hazardous location, such as in a wall of fire or over a pit, the target receives a free attempt to break your grapple with a +4 bonus.
every time you try to move your target into a threatened square.
The general premise is that characters only provoke for moving when they choose to move, not when they are moved by another character.
This precedent is actually set by the other combat maneuvers which don't provoke for their movement unless you have the greater version of them, which specifically state that the movement provokes.
By RAW, no. But there are a couple ways. Greater Grapple lets you maintain your grapple as a move action, then Greater Reposition to move your opponent into some serious detrimental square (and he'd still be grappled), provokes AoO.
That's not the movement from grappling causing the target to provoke, that's the target being moved from Greater Reposition causing the target to provoke.