I came across this nifty bookmarklet on Reddit's /r/bitcoin the other day, I figured I'd share it here.
http://chovy.dyndns.org/chartdraw/chartdraw.htmlJust drag the "ChartDraw" link at the bottom to your bookmark bar, and then go to one of the major Bitcoin charts sites listed at the top of the page. Then click the "ChartDraw" bookmark and you'll see a little drawing application appear around the chart. It also allows you to enter text on a chart.
I use it for drawing lines of support and resistance when looking at what Bitcoin is doing lately.
