What are the Best Charts for Gauging Extremes?

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Just about the only thing I don't like about my beloved ProphetCharts is its lack of some of the sentiment and momentum oscillators that I've heard so much about. StockCharts.com – which is a company I've long admired (shout out to Chip Anderson!) seems to excel at these data sets.

What I'd like Slopers to share with me and everyone else here is their favorite charts for gauging market extremes. Simply stated, I want to know what kind of chart would have compelled me, back on February 5th, to cover all my shorts and go long!

The Simpler The Better! I have no interest in the combination of twelve technical studies would have pointed this out. I'd much rather see a single, simple line graph that oscillates cleanly.

Full URLs are appreciated, and please don't refrain from sharing a chart simply because you think it's too obvious or that everyone knows about it. Thank you.