While the market depth chart is kind of freaky and cool to look at over on Mt. Gox, the market typically does see a drastic decrease of buyers over the weekend. In many areas it's quite difficult to get banks to move money on the weekends, so there aren't as many bids and once they're gone they take time to come back. Also keep in mind that Mt. Gox doesn't show the full volume on their charts/data, they only show buy/sell orders within a certain percentage of the most recent sale price, so there are likely buy orders down in the $10 range that, even though there is a $10 gridline on the chart, won't be shown because they are out of range for Mt Gox's chart-generating algorithm.
I'm not terribly worried, we might get to see another scary weekend low but as long as things manage not to crash completely before Monday or Tuesday we'll see the usual return to normal market volatility after the typically volatile weekend
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