Update:
Well, it's been not quite a month now and I've been taking Cod Liver Oil tablets 3 times a day. I think it IS helping my hair grow faster. A half-inch in 3 weeks. Which is probably average, but my hair used to grow slower-than-average.
I was just at GNC today and bought 'Triple Cod Liver Oil' which has 3x the Omega-3 fatty acids than regular Cod Liver Oil. I also bought Ultra Nourishair, so from now on I won't be able to report on the merits of Cod Liver Oil alone.
I also started taking Centrum Performance last week. I'm just a petrie dish of vitamin goodness. Hope it results in strong, fast-growing beautiful hair!

I'm very hopeful, but skeptical at the same time. If I don't notice significant improvement in a few months, I'll probably save my money.