> Basically I'm wondering what sort of graphical representation would best display the Sharpe Ratio of a particular trade history, i.e. what sort of graph would I have to look at to be able to best guess what the Sharpe Ratio is.

If your equity line looked like a straight line sloping diagonally up then the sharpe ratio would be high indeed (ie a very good strategy). Basically the steeper your equity line slops up the higher the sharpe ration, the more wavey and jumpy it is, the closer to zero your sharpe ratio will be. Not suprisingly many choose to optimise their sharpe ratio.

Another useful ratio is the kelly criterion = av / (sd)^2 = sharpe ratio / sd. This basically gives you an idea of how much you may want to place per trade, as well as being another useful choice to optimise against. It will favour similar equity curves to sharpe ratio but applies even more penalty to variation.

Also, in both sharpe and kelly, people tend to set the av term as being the av return of the stock - the risk free return. Eg if your av return is $1000 but similar money in the bank could have earned $300 then you should use $700 not $1000.