Buy the squeezy bottle with little packets of salt at shoppers drug mart or whatever... I think it helps when you have a stuffed up nose (helps your head generally feel better).
Move to the maritimes. I remember my sinuses were so clear at COCs last year :P
I second salal's suggestion. And then of course the obvious stuff like lots of rest/sleep and fluids. Good luck!
But only use boiled or distilled water to be on the safe side.
Lots of sleep and warm fluids (even just hot water with honey) seem to make the biggest difference in shortening my colds.
what salal says while kicking an Aussie