As a discovery tool, the Web never ceases to amaze. Last night, my brother twigged me on to a cool new music site called 20ltd.com. Here’s the concept, which is definitely different: the site offers 20 items at a time. When those products sell out, that’s it, they’re gone – just like shopping at traditional store. So what you’ve got is a cool supply-demand-scarcity combination featuring really great music. The silver-lining is even if you don’t buy anything, you still get to listen to the music, which we did for hours. I hope the new U.S. streaming music royalty regime doesn’t kill it!