This is actually a public beta. The app was recently purchased by 'Mark/Space' -makers of Missing Sync products.

MySync a small and easy to use app that allows you to synchronize stuff that you normally would have to use .Mac for (i.e., bookmarks, contacts, keychains, Mail accounts, Calendars, AND Yojimbo items). I use it only for Yojimbo stuff.

The full release will be commercial, but there is no clear timetable mentioned. Let's hope Mark/Space keeps MySync's ease of use intact.