Food museums in Germany:

what: chocolates
where: Cologne
www.schokoladenmuseum.de

what: spices
where: Hamburg
www.spicys.de

what: bread
where: Ulm
www.brotmuseum-ulm.de

what: salt
where: Lüneburg
www.members.aol.com/saltmuseum

what: potatoes
where: Fußgönheim/Ludwigshafen
www.kartoffelmuseum.kendzia.de

what: sugar
where: Berlin
www.dtmb.de

what: peppermint
where: Eichenau/Munich
www.minzmuseum.de

what: dumplings
where: Heichelheim/Weimar
www.klossmuseum.de

what: horseradish
where: Baiersdorf/Nuremberg
www.schamel.de

what: asparagus
where: Schrobenhausen/Ingoldstadt
http://www.schrobenhausen.de/museen/spargel.htm

A food museum in Switzerland:

http://www.alimentarium.ch/en_/index.asp

it is in Vevey on Lake Geneva.

Ham museum in Madrid
Museo de Jamon, saw 3 locations,
its a Tapas bar/restaurant, hams hanging on every inch of every wall, in different stages of curing

Every country has a chocolate musuem, but only the web would have a Chocolate Wrapper museum (does that count?) It's a pretty impressive collection.

http://mujweb.atlas.cz/www/chocolate/en/museum.htm

Mustard museum in Mt Horeb Wisconsin (just west of Madison) - never knew there were so many, many kinds of mustard still being made (and the collection of old tins, containers, ceramics is interesting as well).

http://www.mustardmuseum.com/