On my recent trip to Costa Mesa, we enjoyed a great, albeit expensive, happy hour at Hamamori at South Coast Plaza. It was here where I found a neat and easy way to fold napkins.
Start with a square napkin. First, fold both edges inwards at halfway point
Then fold in half hot-dog style
Take both ends and fold at 90-degree angle down towards your body.
Finally, bring the ends inwards towards the center and it should cause the back part to raise up. Basically, this means overlap the two parts of the napkin that are hanging down below the fold. This should cause the back to stand up, and voila!