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I agree with Steve. If you want to be creative, square filters are the only way to go, although any of the circular (Polar, Star etc.) filters designed for use in the square filter holders can be a bit of a nuisance and the only way to get proper control is the do your rotations on them before adding your other filters.
Back to the original question, one of the problems with digital over film is the dynamic range of the sensor. When shooting landscapes, for instance, it's all too easy to blow out the highlights, or lose the shadows. HDR is a solution, but requires a lot of forethought and post-production. The simple solution is the graduated filter which really only works in the square format giving you loads of control.
Filters can rescue a picture, filters can make a picture, but just as easily they can ruin a picture - Go carefully.
I had a copy of the book "The Digital Photographer's Guide to Filters" which is very good (If the person I loaned it to is reading this. - Can I have it back?). It's available from Amazon at a knock-down price at the moment. Grab a bargain.
Good luck,
Chris
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