Short-Selling: What You Need to Know Now

From How Do I Find Short Interest for a Stock?:

Anyone who takes a short position in a stock is entering an interesting situation: In order to exit the position, he or she has to "cover" or buy back the shares that are being shorted. So if a stock has a very high percentage of its shares being shorted, it means that there are more investors who need to buy shares at some point, whether the stock goes up or down.

This is interesting because those who have already taken a short position need those who own the stock (or are "long") to sell their shares and push the price lower.

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