I really like tart citrus vinaigrette sauces for grilled and sauteed seafood -- especially salmon. They are delicious and colorful. Also, they are equally at home on seafood and salad, so you can prepare a plate with a nice salad and a piece of salmon and drizzle the sauce over both.
These are basically just a blend of olive oil, vinegar or citrus juice, and whatever flavorings you care to try -- fruit, spices, etc.
Here are three variations that I have used on salmon that all work very well. Just toss 'em in the blender. The proportions aren't at all critical, so experiment and adjust to taste. I tend to like 'em nice and tart, so I'm likely to lean on the lime juice or vinegar.
                      
* Exported from MasterCook *
                        Lime Scallion Vinaigrette
Recipe By     :Webb Collings
Serving Size  : 4     Preparation Time :0:15
Categories    : American                        Salad Dressings
                Sauces                          Seafood
  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
     1/4           cup  fresh lime juice
  3                     scallions -- sliced
  1         tablespoon  dijon mustard
  2        tablespoons  honey
     1/2           cup  extra virgin olive oil -- or more if needed
                        Salt and pepper -- to taste
Combine juice, scallions, honey,  and mustard in a blender or food processor and blend until smooth. Add the olive oil and blend until emulsified. Season with salt and pepper, to taste.
Description:
  "Bold citrus sauce for seafood or salad."
Yield:
  "1 cup"
Start to Finish Time:
  "0:15"
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Serving Ideas : Serve with Pan-seared or grilled salmon
                      
* Exported from MasterCook *
                         Basil Citrus Vinaigrette
Recipe By     :Bobby Flay
Serving Size  : 4     Preparation Time :1:20
Categories    : American                        Bobby Flay
                Salad Dressings                 Sauces
  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
     1/8           cup  fresh orange juice
     1/8           cup  fresh lime juice
     1/8           cup  lemon juice
  4                     basil leaves -- chiffonade
  1         tablespoon  finely chopped red onion
     5/8           cup  pure olive oil
                        Salt and freshly ground pepper
Combine juices, basil and onion in a blender or food processor and blend until smooth.  
With the motor running, slowly add the olive oil until emulsified.
Season with salt and pepper, to taste.
Description:
  "Bold citrus sauce for seafood or salad."
Source:
  "The Food Network"
Copyright:
  "Copyright Bobby Flay"
Yield:
  "1 cup"
Start to Finish Time:
  "0:20"
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Serving Ideas : Serve with Mango Tortilla Salad & Red Chile Scallops
                      
* Exported from MasterCook *
                      Roasted Red Pepper Vinaigrette
Recipe By     :Emeril Lagasse
Serving Size  : 4     Preparation Time :0:30
Categories    : American                        Beef
                Ethnic                          Fish
                Salad Dressings                 Sauces
                Seafood                         Spicy
  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
                        
  2                     red bell peppers -- roasted and peeled
  2        tablespoons  Lime juice or Lemon Juice or Rice Vinegar -- or more to taste
  1         tablespoon  Dijon mustard
  1           teaspoon  honey
  2             cloves  garlic -- chopped
  1         tablespoon  chili garlic sauce, Chinese
  1                     shallot (or substitute red onion) -- chopped
  1                cup  extra virgin olive oil
                        
                        salt -- to taste
                        white pepper -- to taste
                        cayenne pepper -- (optional)
                        hot sauce -- (optional)
To roast peppers, place whole, uncut peppers over an open flame or under broiler until the skin begins to blister and turn black, turning to get all sides. Take roasted peppers off flame, and put immediately into a brown paper bag to steam them. Let them remain in bag for approximately 10 minutes, then remove from bag. The blackened skin should peel right off the peppers. 
In  a blender or food processor, combine the peppers, vinegar/citrus juice, mustard, honey, chili paste, garlic, and shallots. Season with salt and pepper. Blend for 1 minute. With the blender running, slowly add the oils and continue to blend for 1 minute. Season with salt and pepper.
Yield: about 2 cups
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Serving Ideas : Use as a marinade and sauce for Grilled Salmon.
NOTES : The more oil, the thicker. Can substitute stock for some of the oil. Can use part olive oil and part vegetable oil for lighter flavor.
                      
* Exported from MasterCook *
                         Spicy Orange Vinaigrette
Recipe By     :Bobby Flay
Serving Size  : 8     Preparation Time :0:00
Categories    : American                        Bobby Flay
                Fruit                           Salad Dressings
                Salads                          Sauces
                Spicy
  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
  3               cups  fresh orange juice
     1/4           cup  sherry vinegar
  2          teaspoons  Dijon mustard
  2          teaspoons  ancho chile powder
  1                cup  olive oil
Heat orange juice in a medium saucepan and reduce to 1/4 cup. Let cool slightly. 
Combine the orange syrup, vinegar, mustard and ancho chile powder in a blender and blend 30 seconds. 
With the motor running slowly add the oil until the dressing emulsifies. Season to taste with salt and pepper. 
Source:
  "The Food Network"
Copyright:
  "Copyright 1999 Bobby Flay"