Split in half and grill to warm the meat.
Serve with the simplest of dressings.
Don't fall for the thick cheese sauces or similar served as a gratin - it really spoils the texture of the lobster flesh.
If you want to have it out of the shell, remove the white meat, dice and serve in a salad or in a black squid ink pasta with no more than a little high quality olive oil..
If it is one of the bargain lobsters that are in some of the supermarkets at he moment, the meat to go for is the tail, not the from the head.
Soup? Just make a good stock from the shell and all the trimmings. Reduce and add loads of cream, brandy and season to suit. Serve with a little of the flesh reserved to dress it up and add a meaty texture, plus another dash of cream for effect in the bowl and garnish with chopped tarragon or another fresh tangy herb.
If you get bored here's 650 other ways..:
http://www.astray.com/recipes/?search=lobster