Westpfal uses the wet wheel method, in which the blade is carefully pressed against a spinning moistened wheel. You can ruin your knives by entrusting them to a grinder who doesn't know what they are doing, or uses a machine method.
They don't just sharpen kitchen knives: they will also work on scissors, pinking shears, toenail and cuticle nippers, and straight blades. Prices are per-piece and run $3.50 -$7.00. Expect a 3-5 day turn-around.