The excellent Windows Phone 7 connector for the mac is now available for free from the Apple App Store, which means grabbing any updates will be super simple, so is a highly recommended update…
Windows Phone 7 Connector is a simple, easy-to-use application designed to sync your favorite media files from your Mac, with your Windows Phone 7 or Zune HD. You can also sync photos and videos you captured on your phone with your Mac, and when needed, update your Windows Phone 7 software.
You may find you need to delete any existing versions of the app in order to get the Apple App Store to go ahead with the install.
via Mac App Store.