Microsoft released a Skydrive app for Mac OS. It adds the same integration to Finder that Dropbox provides.
https://apps.live.com/skydrive/app/f644a8ef-9f98-4d1b-a3d2-eab969b0fd44
https://apps.live.com/skydrive/app/f644a8ef-9f98-4d1b-a3d2-eab969b0fd44