Have you noticed all the Zune HD unboxing galleries around the Interwebs right now? While it hits stores today, no one’s been able to completely review it yet— Microsoft has only just posted the required Zune 4.0 software online. If you’ve already got your Zune HD, what are you waiting for? [Zune.net]

New features in the Zune 4.0 software include quickplay, smart DJ, mini mode, mixview and the Zune Marketplace:

We’re up finishing the full review as I type this, but while you wait:

• Zune HD Hands On: Photos and Video Tour
• Zune HD TV Interface Walkthrough
• Microsoft Says No Zune HD Outside the US (For Now)