Tosh-ds has updated his Choplifter game for the Nintendo DS:

Got the collision detection pretty much down now. Atleast when it comes to the soldiers, and basic chopper movement. Might have to work a bit more on collision response though.
Added basic logic to the soldiers, so they'll both find the chopper, and bases. And get out of the chopper when it lands on a platform near a base. Check out the new demo!

Download Here --> http://nintendo-ds.dcemu.co.uk/choplifterds.shtml