Hmmm,<p>I wonder if we could create a simple little Web site people could post markets with virtual monopolies that that would like to see disrupted. It could act as an ideas board for entrepreneurs looking for fertile start-up areas.<p>It could be a simple post, but with the opportunity to flesh it out out with information on barriers to entry etc,potential market size etc.<p>You could post about blackboard. I could post about TES.com&#x2F;jobs which has a virtual monopoly on advertising jobs in the UK teachers market, despite appalling service and ludicrous prices.