Much apreciated Big A. Stockcharts.com do some really excellent charts
and indicators that don't appear in the usual list of TA indicators.
Here's a list of them for anyone interested.
http://stockcharts.com/charts/catalog/09.html
Here's one I like.
The Bullish Percent Index.
The Bullish Percent Index (BPI) is a popular market breadth indicator that is calculated by dividing the number of stocks in a given group (an exchange, an industry, etc.) that are currently trading with Point and Figure buy signals, by the total number of stocks in that group. Bullish Percent levels that are above 70% are considered overbought, whereas levels below 30% are considered oversold. Strong buy signals occur when the Bullish Percent Index falls below 30% and then reverses up by at least 6%. Conversely, promising sell signals occur when it goes above 70%, and then reverses down by at least 6%. It is important to note that the Bullish Percent Index is not something that can be applied to a single stock but rather an index that is calculated for a group of stocks. The most popular version of this chart is the NYSE Bullish Percent ($BPNYA) which is mentioned prominently in Thomas Dorsey's book, Point & Figure Charting however it is important to remember that the Bullish Percent index can be calculated for any grouping of stocks.