So we may very much have reached a top, at least a cyclical one, even though the fundamentals should suggest a secular one. I already mentioned this last week (Apogee of exuberance, paroxysm of irrationality. Sign of a top?), and it's been confirmed for now but here are some impressive charts to back that up.
S&P 100 Bullish Percent Index (click for bigger image)
[Update: I hadn't seen this one, but even Lehman Brothers shares surged in the last several days, and went from $0.05 to an intraday high of $0.32, which is about +650% in one day.]