I seen Jamie Oliver as well as other chefs do this http://www.bbc.co.uk/...ing/recipes/028.shtml
Have you done this before and what were the results like? Im guessing that main attraction of cooking fish this that it keeps the fish moist?
Yup, to keep it moist. And to waste salt! Another good way to keep fish moist is to bake it 'en pappillote' - either in a greaseproof paper or a foil 'parcel' Add aromatics on top of fish, such as lemon, herbs, pepper, chili flakes or what you want, add juice, wine or water (just a drop) wrap in a loose packet, and put in the oven as usual. Stops the kitchen smellong like Billingsgate fish market too...
We had sardines cooked in salt on a barbeque in Portugal and weren't impressed. It wastes a lot of salt and I don't think it really did anything to the flavour at all. Cooking it in foil would be just as effective.