I take fish oil to help maintain good heart health--I get the odorless kind at Costco.
I don't think high omega-3 intake per se will help weight loss. But people who consume a lot of omega-3 fatty acids via food tends to have good dietary habits (and most likely, active lifestyles) which contributes to healthy weight.
Current program: 1,800 calories most days of the week; 45-60 minutes of mixed exercises (weights, cardio-kickbox, dance, athletic intervals) 6 days a week
Current goal: 135 pounds by birthday (July 14th) and to run half marathon at end of May.