Here's an interesting one for fish stock.

That would be handy if I prepared a job lot and froze it in say pints in tupperware, for when I want to make a paella.

Now I need a tupperware party.

Damn, I must be changing sex or something.

Oh, yes, the recipe: -

http://fastcooking.ca/pressure_cookers/soups_stocks_recipes_pressure_cookers.htm#fish_stock