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The system is running but the air is not very cold, what's wrong?

If some cooling is taking place but not enough, then the chances are that the system is low on freon. The only reason a system would need freon is because the freon leaked out.  If the leak is not sealed before recharging with freon, the freon will eventually leak out again......  

Leak repairs are expensive so if it's a small leak it may be more cost effective to recharge the system every two or three years.  Freon recharging is not a do-it-yourself job.  As per federal law (EPA), only people certified to handle refrigerant (freon) are allowed to recharge an air conditioning system.

Outside Unit Is Dirty Or Air Around Outside Unit Is Blocked:

Visually check the coil of the outside unit to make sure that it is not excessively dirty or blocked. If the coil is dirty you can flush it with a garden hose.  Keep water clear of electricals.

Compressor burnt out or locked, or not running for some other reason:

If the fan on the outside unit is running but you do not hear the sound of the compressor running, then the compressor is malfunctioning.  This would be a very serious problem requiring an a/c contractor.

Air Return is sucking in hot air:

If you have an air return duct in a hot area such as an attic or garage, make sure that this duct is not broken, split, or disconnected and sucking in hot air.

And, don't forget!  Dirt is the biggest enemy of your air conditioner!  Giving your air conditioning system an efficient, high MERV rating air filter is the best thing you can do for your air conditioner. A good air filter will extend the life of your air conditioner because the important parts, like the blower assembly, the cooling coil, and other  inner parts will stay cleaner, operate more efficiently and last longer.

And, as a side benefit of having a good air filter, your family and you will enjoy breathing much healthier indoor air.  Air that will be free of dust mites, mold, mildew, dust, pet dander, etc. etc.