I found a hot-key that can make iTune cycle thru it's Visual.

Step 1. Start iTune.
Step 2. Click on Visual button to make iTune display Visual
Step 3. Press AppleKey + S

iTune will change to next visual, and display it's name at upper right of the screen

OK, I know I am Cool. but how to type the Apple symbol anyway? :D

Makes the Visualization stop for me. I know that the z,x,a,s,q,w keys by themselves control the visualizer. Cmd+S= visualizer stops.