Canon do a Waterproof Sportcase for the Ixus 300 (For use when diving with the camera, probably a bit extreme for kayaking... =)

I'm sure other manufacturers have similar items available.

Jazz
(List 112, Mk2 12 gig #40. Mk1 4 gig #30. Mk3 1.6 16v)
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Jazz (List 112, Mk2 42 gig #40. Mk1 4 gig #30. Mk3 1.6 16v)