I added spacing feet to the cable box, DVD and receiver to help improve ventilation. Heat is the biggest contributor to component failure, so I want to make sure there is adequate air flow.
I made these feet out of 2" PVC conduit (left over from the video cable run). They are about 1 1/4" tall. I plan on painting them flat black, so they are not noticeable. More info: Detailed "how to" article on adding spacing feet.
Here is a picture of the speaker mount...
It's nice to finally have the speakers spread out to the correct positions. It definately makes a difference in the sound quality.