Its a vintage style manicure (thats Dita's hands on the right). It was all the rage in the 40s I believe.

The easiest way to achieve the look (and yes I do it to myself) is to stick those french manicure guides on your nails where your moons are (or should be if you have none) and then paint with normal varnish. when its all completely dry, peel off the manicure guides and voila!

I have also had it done at a salon by a guy who used no guides at all apart from that very pic. I'll put a pic of my own nails in the album.

this is a super old post, but since I am still doing this manicure on myself, I'll respond anyway!

The half moon manicure actually dates back to the 1920's. I have taken to using those stick on reinforcements made for 3-ring paper to help make the shape. I had been using french manicure tapes, but prefer the more curved line from the reinforcements.

-I put a clear base coat on, wait for it to dry.
-stick 10 reinforcements to my bare leg (lol...takes some of the "stick" away so it doesn't ruin your base coat)
-apply one reinforcement to each fingernail, you can make the half moon part as deep or as shallow as you like
-paint on two coats of your favorite darker polish (I love the reds myself, but this was done with green, blue, you name it!)...let polish dry between first and second coat
-after the second coat of colour, I like to use a quick dry topcoat (my preference is seche vite). I apply the quick dry top coat to ONE nail, then remove that reinforcement right away before the top coat sets (otherwise, you may rip underlying coloured coats off).....then clear coat the next nail and remove the sticker....and so on until all 10 are done.

It sounds time intensive, but after you get the hang of it, it's pretty quick and relatively easy!