Another one that would be good to have is a moving average of the buys volume:sells volume ratio over windows of e.g. 10m, 1h, 3h, etc.
Here is one question, as I can understand you meant trading volumes here. What if buys is zero in current slot? or more over what if sells volume is zero or very small? In those cases the metric will have no meaning. Or what did you mean?
Perhaps (buys-sells)/(buys+sells) (if buys+sells=0 then 0) in that period then. The idea is to compare the relative volume of buys and sells in a time window to see if the market is bullish or bearish during that period.
Also the charts seem to be glitching out periodically where nothing is updated except sells. Happens at the same time on multiple exchanges so I assume it's not on mtgox's end, what's up with that?
http://i.imgur.com/3J66QgP.pnghttp://i.imgur.com/5DnrqRy.pnghttp://i.imgur.com/VmRQ1Fz.png
