Clean your crabs while alive by putting on some thick oven mits, remove top shell, and rinse out body cavity. In a sauce pot, add a little olive oil, a bunch of fresh, crushed garlic to taste, a shallot and sweat the flavor out for a couple of minutes. Add a can of tomato sauce, a can of crushed tomatos, about half cup of white wine, some salt / pepper (crushed hot pepper if you like a little spice), half a can of water, a little bit of bay leaf and parsley (sometimes I use a sprinkle of Oregano as well), add your crabs and let that puppy simmer for about an hour.
After it is about 95 % done (you will know, they smell great and the crab meat is cooked well) add a couple of pounds of mussels, maybe some clams (there are alot of variations) another half cup white wine, taste and re-spice if needed and let this simmer again until all shellfish have opened. Boil up some linguine and go for it. Delicous
The trick is to use live crabs, so cleaning can be tough until u get used to it. Just grab them from the back, get a thumb under the rear leg, the other thumb under the shell point and remove the shell. With heavy mits, you can control the little bugger very well.