Mt. Gox publishes live data which is available at mtgoxlive.com. The chart includes the current market price as well as a depth chart of existing bid and ask prices, which I assume is compiled from the order book of each account with the exchange. However, orders are allowed to be placed on Mt. Gox without having available funds in ones account to actually make a trade. If the depth chart reflects these unfunded orders, they would make the chart steeper than it should be. Of course, the depth chart may also not reflect trades which people have the funds and intention to make but haven't yet placed in the order book. In sum, does the mtgoxlive depth chart reflect unfunded orders, and in any event, how useful, accurate, or predictive is it?