A nice collection of flank steak recipes has been posted already here on TKL. Below I have done a copy/paste on a few.

To look at the other, just search TKL for : flank steak

Title:
Recipe(tried): Flank steak recipes
Posted By: marilyn
Date: July 29th 1998
In Reply to: ISO: Flank Steak Recipes
Board: What's For Dinner?

London Broil

1 1/2 to 2 pounds flake steak
1 cup salad oil
1/2 cup lemon juice
1/2 cup soy sauce
4 tablespoons Worcestershire sauce
1/2 teaspoons garlic powder

Soak steak for 2-3 days in marinade, turning twice a
day. Broil for 3-5 minutes on one side and 2-3 minutes
on the other. Cut meat on bias to serve.

Stuffed Flank Steak

1 3pound flank steak
2 tablespoons butter
1/2 pound fresh mushrooms, sliced
1 clove garlic, crushed
2 tablespoons Roquefort or cheddar cheese
1 teaspoon salt
1/4 teaspoon pepper.

Cut lengthwise pocket in steak. marinate in favorite
marinate for overnight. Saute mushrooms in 1
tablespoon butter for 2 minutes. combine mushrooms,
cheese, remaining tablespon butter, garliic, 1/2
teaspoon salt and 1/8 teaspoon pepper. Stuff pocket
with mixture. Fasten with skewers or toothpicks.
Sprinkle with remaining slat and pepper. Refrigerate
until shortly before serving time. Broil about 3 inches
from heat for 6-8 minutes, depending upon size and
thickness of steak. Place on warmed platter. Slice
inthin slices against the grain of the meat. Serves 4

Mead Marinade
1/2 cup cooking oil
2 tablespoons red wine vinegar
1 tablespoon coarse black pepper
1/4 cup soy sauce
2 tablespoons dry mustard
1/2Teaspoon parsley
4 teaspoons Worcestershire sauce
3/4 teaspoon salt
1/2 teaspoon garlic powder
2 tablespoons lemon juice
Mix all ingredients together until thoroughly mixed.
Sprinkle meat generously with tenderizer and pour
marinade over meat. Refrigerate for 12-24 hours,
turning meat often.