http://ping.fm/KncRg A polarizing filter is one of the most useful filters you can own. In my opinion, it should be the first filter you purchase. These filters work by cutting the glare that appears on many objects. This includes glare from tiny water droplets in the air that may distort the color of the sky.

When the glare on objects is reduced it results in more color saturation and more contrast in the image. You’ll notice that the sky looks bluer and leaves look greener. It is also great for taking pictures of water because it reduces the amount of reflection you get on the surface allowing you to see the details in the water. These effects make this filter popular for landscape photography.

Here is a better explanation about what a polarizing filter will do...

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