Fish oil and Omega-3 has many benefits. Among the most popular is cardiovascular health. In fact, there are studies comparing fish oil to statin drugs which show that fish oil is actually safer and more beneficial than statins, believe it or not. And as I said, that is just one of the benefits. Fish oil is also great for joints, hair, and skin. Just do a google search on fish oil studies and you'll find plenty of info out there.
When selecting a fish oil supplement, keep in mind that it is important to try and use something which is pharmaceutical grade and preferable NSF certified. This ensures that you are getting the highest quality product and most bioavailable form available. Meaning, your body will absorb it. Personally, I use Usana but as I said, the important thing is to try and use a pharmaceutical grade product.