ryan - when you get to higher levels, you also get 'clearance' missions, which require you to go to a sector, pwn some dudes, go to another sector, pwn some more dudes, then go back to your home sector. Basically as cross between assasination and courier...
He he - I do better if I leave the mouse-y thing in the top corner than if I play normally... That may just be because I'm strange... I don't know for sure!!