Easiest way to root Nexus 7: Nexus 7 Toolkit

Rooting the Nexus 7 using the toolkit makes it all dead simple.
Here are the steps after downloading the toolkit:

1. Install the drivers.
• The toolkit installs drivers, but that didn't work for me on Windows 8.
• Download and install them from the ASUS site
2. Enable debugging mode on tablet
• Go to Settings > About
• Tap multiple times on Build Number at bottom
• This will unlock Developer Menu
• Hit the back button and go to the Developer Menu
• Enable USB Debugging
3. Plug in the Nexus 7 to your PC via USB
4. Run the toolkit and choose your Android version
• If the toolkit can see your tablet, it will list the serial number at the top
• If it cannot, it's most likely a driver issue (re-install drivers/restart PC)
5. Select #8 "1-CLICK FOR ALL..."
• Follow the prompts.
• This will take care of everything for you.

Notes:

1. I chose to go with TWRP instead of Clockwork
2. Because I'm using the newer 4.2 Android, I went with supersu. (Superuser does not support 4.2 yet)