Here are a few glitches in headlong. You have to do it with 2 players or more or else it wont work.
1) First, place a warthog at the edge of the slanted bridge so that the passenger seat is facing the huge circle building thingy. Get a banshee to push it, its much easier this way. Next, 1 person get into the passenger seat with a sword. That person will whack the banshee with it. If not, it wont work. Next, the person in the banshee flies towards the huge circle building thingy. Keep flying in the same direction. The person in the passenger seat gets off, and he will start flying.
This is my favorite one:
2) This one has to be in a specific location to work. Its near the base with the covenant vehicles, at a wall. Get a wraith, and the other person will crouch with his back on the wall. The guy in the wraith will boost at him, and he will go flying.
How to get on to one of the cranes:
You have to use fake lunges for this one AND the other person has to keep jumping near the walls for it to work so that the person doing the fake lunge will fly up. Fake lunge at the buildings to the right of the bridge. Keep doing that until you see a crane. Getting on to the crane with 2 people is hard, but my friend and i eventually got up there. Its much easier with 3 people. Its the perfect sniping place up there! and the good thing is, no one can fly up there because there's an invisible wall in the way.
Ill post glitches on zanzibar later.
ADDITION:
QUOTE(Cammz2.5.CoA @ Jan 10 2005, 12:42 PM)
Here,You post gilitches & Tricks from Halo 2
For a start...
Carry a rocket launcher and a noobstick(zerg lightning sword thing).
use RL to follow with rockets and shoot and quickly charge and you charge right to the followed enemy.
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btw, that trick is called the rocket jump...