here's an easy to make crab bisque from paula's home cooking on foodnetwork:

crab bisque:

1 (10 3/4-ounce) can cream of asparagus soup
1 (10 3/4-ounce) can cream of mushroom soup
1/4 cup milk
1/4 cup half-and-half
1/2 pound crab meat, picked free of shells
1/4 cup dry sherry

Using a heavy saucepan, combine all of the ingredients and bring to a boil. Reduce the heat and allow to simmer for 5 minutes.
Serve with your favorite crackers