The common cold is one of the cleverest things on the planet. It will never be eradicated, because as soon as we learn to fight off one strain, a new one evolves. This is the key to it's success - evolution. If nothing else, while you are fighting the symptoms, you can accept that you are playing host to one of nature's true survivors.
I also have a theory. We need colds. Just like an early morning jog, or a great aerobics session, the common cold is a regular workout for your lymph glands and immune system. I wonder how weak our defenses would be without regular colds to keep their response times up.
If you are feeling the effects of a cold, try changing your approach. You can do all the usual things (plenty of water, throat sweets etc.), but remember that your internal energies are focusing on fighting the cold. So don't expend yourself physically. Use the cold time to relax and turn your focus inward. A cold tends to blur your senses, so go with it. Let it wrap you up for a while. Enjoy the slight buzz it gives you. And use it as an excuse to put off some of the jobs you hate to do.