E-miles is one of the "something for nothing" sites; you get the occasional chance to get a few points for reading ads. It's relatively effortless, and when you get enough points to reach 500, 500 miles will be posted at the beginning of the next quarter to your chosen airline program.

I never count on these kind of miles, so it's always a surprise when indeed they show up in a FF account.

I was truly surprised to reach 500 e-mile points just before the end of March; they posted to my Delta acc't on April 1st, where wonder of wonders, they apparently will count as a "unique partner", worth an additional 1000 points(when 4 other unique partners also post)