This is a really cool find for those with Zune HD devices and an Apple Mac computer. A person at Zuneboards discovered how to apply a simple settings change to allow syncing of your Zune HD with a Mac via the Windows Phone 7 Connector software. This link contains the details, which is basically a simple three-step process.
I just confirmed that this does indeed work for my Zune HD device connected to my Apple iMac desktop computer. I now have the option to sync photos from my iPhoto library, as well as videos from my iTunes library. Pretty cool!