I've read that one should hand-wash knives, and I mostly buy that. I've also seen advice that one should dry them immediately and put them away.
Why shouldn't knives air-dry? Aside from the unsightly water stains, is there any downside to letting knives air-dry?
Edit: We have Henckel full-tang knives. Rust is a real concern -- we had them sharpened, and the shop did a lousy job -- the edges are ragged.