Pumpkin Soup with Shrimp and Lime

I'm in love with pumpkin right now, can you tell?  This is one of my absolute favorite soups -- zesty and unusual and kind of addictive.  Also, it's fairly simple.

Pumpkin Soup with Shrimp and Lime

2 Leeks (white part only) -- coarsely chopped
1 tbsp. Oil
1 can Pumpkin puree
4 cups Chicken broth
1 tsp. Salt
1/4 tsp. Pepper
1 Lime -- grate zest and squeeze juice
1/4 tsp. Cayenne pepper
1 cup Whipping cream
1 lb. Cooked salad shrimp
2 pints Grape tomatoes -- halved

 In a 3 quart kettle, sauté leeks in oil until tender. Add pumpkin, broth, salt, and pepper. Heat to boiling. Add lime zest and juice, cayenne, cream, and shrimp. Cover and simmer for 15 minutes. Stir a few grape tomatoes into each bowl of soup.