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Unlike Jeffrey I use a polarizer frequently on wide angle lenses, including the 10-22. He is referring to the tendency of an open blue sky to show the variation in polarization, in the form of a darker blue area or band. That's because the wide angle lens encompasses such a wide view that it can include the part of the sky with greatest polarization (90 degree angle to the sun) and those with less, which highlights the difference.
But for all of the many other uses of a polarizer, such as reducing glare from wet or glossy non-metallic surfaces, reducing glass window reflections, and increasing foliage saturation, it works just fine with a wide angle. I would never be without one.
You probably don't need a slim filter with the 10-22. I don't have vignetting with my 77 mm B+W XS, which is moderately thick with still has outer ring threads. I haven't seen frequent reports of vignetting with the 10-22 with polarizers in general.
Dave
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