Windows Phone 7 Connector is now available at Mac App Store at no cost . WP7 users do not need to boot up Windows in their Mac to sync with their phone anymore . Here is the download link : http://itunes.apple.com/us/app/id415571499?mt=12
However , I do think the combination of Windows Phone 7 and Mac is a strange pair . I , as a Mac user , would prefer iPhone as my phone , though . For WP7 , I would prefer to stay sync with my Windows PC .