Mark,
Those little plastic deals are actually coated in teflon and are called Magic Sliders or Magic Gliders, depending on where you get them. They come in a variety of sizes. They are incredible for making heavy things mobile. The furniture really does glide.
Prior to going with my HT setup last year, I had a VERY large (6' x 6') solid oak Entertainment center with doors & drawers. The usual components and a 32" Sony TV were inside the beast. The word heavy does not come close.
Slid some of the 5" Sliders under each corner and my wife could move it herself. Based on the experience, when I had my custom HT stand made, again from solid oak, I designed three sets of feet into the bottom of the stand with 1 1/2" Sliders. Incredibly easy to pull the stand out and work behind it.
Just wanted to share. By the way, why don't we have a Tweaks section, or at least a Sticky for tweaks in the Technical Question section? I love coming up with stuff for Amie to think about
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