One of my favorite treatments for a cold is Hot and Sour Soup from one of our local Chinese restaurants. I love this stuff. It has just the right amount of spiciness and really opens up the sinuses. I have found some mixes in the grocery store that I've used to make it at home, but nothing beats the restaurant-made version. (And no, I've not tried to make it from scratch. I'm just not that good.)
Good news is I'm feeling better today. Still not fully recovered, but getting there. Did I mention that I hate summer colds?!?!?