Thought I'd bring a product being discussed on avsforum to people's attention. http://www.avsforum.com/avs-vb/showthread.php?s=&threadid=456614&highlight=green+glue (a couple of other threads too, search for them) Apparently more effective than resilient bar at soundproofing, especially good for controlling bass frequencies. Easy to apply, takes up less space than resiliant bar too. Now, this might be snake oil, but people over there seem to be rating it. Certainly it looks like a far easier \ cheaper solution than the alternatives. Just wish I found it before I put the floor I was soundproofing back down. I've emailed them to see if they'll ship to the UK.