This is an older blog entry, but I thought it might be useful anyway. It's a listing of keyboard shortcuts for the Zune software:
Zune articles. Archived stories from Zunerama's Zune blog.15 Keyboard Shortcuts for Zune Software
zune graphic
If you're one of those Type A people who hate to have your hands leave your keyboard's home position to work that pesky mouse, here are keyboard shortcuts you can use with Zune Software:
ALT+1 - Zoom video size to 50%
ALT+2 - Zoom video size to 100%
ALT+3 - Zoom video size to 200%
ALT+ENTER - Toggle display for full-screen video
ALT+I - Sign in to Zune services
ALT+LEFT ARROW - Retrace your steps back through your most recent views in Zune
ALT+RIGHT ARROW - Retrace your steps forward through your most recent views in Zune
ALT+O - Show items on the Options menu
CTRL+1 - Switch to full-screen mode
CTRL+2 - Switch to compact mode
CTRL+7 - Switch to the second library view. For example, switch to the Artist view in the Music category.
CTRL+8 - Switch to the third library view. For example, switch to the Album view in the Music category.
CTRL+9 - Switch to the fourth library view. For example, switch to the Songs view in the Music category.
CTRL+B - View the previous item
CTRL+E - Highlight the Search box