Sorry, this is long, but I think it's informative about the common cold.
I too have a cold and am sick of viruses. I have no use for them... jerks. They just have a chip on their shoulder because they're not really "alive". Last night I had a fever and woke up with cold sweats twice. I'm on the downswing now, though, so at least I have that going for me.
Here's the deal with the common cold:
They are usually (almost always) caused by viruses. Antibiotics only treat against bacteria and are useless with viral colds. The few bacterial colds that people get are usually a secondary infection to a viral cold. The term "cold" is really a misnomer. It's really an upper respiratory infection and is transmitted person-to-person. The reason we get them more frequently in the winter is because we're mostly indoors and in closer contact with jerks who don't like to wash their hands and cough and sneeze all over everyone.
As for remedies and cures, since each type of cold virus (about 200) acts differently in our bodies based on startpoint of infection (nose, throat, etc.), the current state of our immune system, the virulance of the virus, etc., many people coincidentally take certain "remedies" and think they help when the have a less severe cold. Vitamin C is not of much use, as long as your general diet is good and you're getting enough. The body can only utilize about 250mg a day, so taking 500 or 1000mg tablets is a waste of money since it goes down the toilet with your yellow pee. Echinacea, I'm sorry, there is more scientific proof that it doesn't work (studies) and none that it works... another waste of money.
Zicam and Cold-Eeze both use the same active ingredient and actually have the potential to work. Their active ingredient is zinc gluconate, or ionic zinc. Regular zinc does not work, it has to be ionic. So, all these supposed cold remedies with regular zinc do nothing but overload your body with zinc.
Here's how Cold-Eeze and Zicam work: Viruses have attachment sites on their protein coat which are oppositely charged to receptor sites on the cell membrane of your body's cells. This is how they attach and infect your body's cells since opposite charges attract. Ionic zinc also has an opposite charge to the viruses' attachment sites. The ionic zinc actually attaches itself to the virus, blocking it from attaching to your body's cells, and you simply swallow the virus and get rid of it in your digestive system. So, it is really a "mechanical" removal of the cold virus.
There is a catch with ionic zinc, however. By the time you start getting symptoms of a cold, you're REALLY infected. Unbeknownst to you, your body has been trying to fight this virus for a few days and has been losing the battle. The virus has replicated so many times and is so abundant, that the only thing left for your body to do is take extreme measures. This is why Zicam and Cold-Eeze instructions state to take at the first signs of a cold... because you're catching the infection while it is still young, while there aren't as many viruses to "kill" off as there will be later. So, taking Zicam or Cold-Eeze halfway through a cold is also a waste of money. Additionally, if your cold starts in your throat, you're better off taking a losenge, whereas if it starts in the back of your nose, you should take a nasal spray or use the swabs. You're also supposed to keep taking it after the symptoms go away... this is because if the ionic zinc was successful, your body hasn't naturally fought off the virus. There are likely some viruses still left and they may start your symptoms back up unless you get rid of every last one.
So, bottom line is: colds suck. The best cure is prevention. Everyone should wash their hands frequently and quit coughing/sneezing without effectively covering your mouth (like do it into your shirt sleeve)... and don't go to work sick. More productivity will be lost for the company because of the cold that gets passed around, than if you would have just stayed home for a couple days and been the only one to get sick.