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http://images.google.com/images?um=1...=Search+Images

polarising filters are ok for blue sky and reflection reduction


there's no one filter that will improve the quality of your images each filter has its own job and needs to be used for the right situation
or effect look up hoya or hama (filter brands) and see what they have to say, and see what filter gives you what your looking for

http://www.hoyafilter.com/

http://www.hama.co.uk/specials/filter/index.hsp

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"I am forever chasing light. Light turns the ordinary into the magical."
- Trent Parke

"Life as it unfolds in front of the camera is full of so much complexity, wonder and surprise that I find it unnecessary to create new realities. There is more pleasure, for me, in things as-they-are."
-David Hurn