Isolation disc for speaker spikes on wood floors.

fully agree

How about cone coasters from Sound Anchors? I am using under my B&W 800's and two 15" subs.

http://soundanchors.com/products/2055/conecoaster

The Herbies teflon gliders are nice and allow you to move the
speaker around to optimize the sound. I use them on a thin
carpet floor and really appreciate being able to easily move
the speakers if I have to. As an aside, Jim Smith from
"Get Better Sound" recommends these over spikes in
many cases, as the bass is more natural. Of course, that's
always going to be room and taste dependent, but I thought I'd
throw that in. For a non-sliding puck, I like the Linn
Skeets, as they have a small center hole for the spike to sit
in without damaging the sharp point. Good luck.

Palasr - intrigued by the viablue spikes. Wonder how well they would work over Herbie's gliders, which I am happy with mostly due to their maneuverability. Good looking spikes - any further comments, tips, etc on their application/installation?

I have tried many many of these under my Tannoy speakers, ranging from the typical 5 cent coins all the way to expensive Harmonix footers. The best value for money and most effective turned out to be the "Linn Skeet". You can find it on ebay UK. Produced by Linn with real engineering behind it, not just typical tone control stuff that other tweak-accessories companies sell. Try it, you will thank yourself for saving a lot of time, effort and money. Costs only GBP 50.