Billy,
Two weeks ago I posted that we had hit the death cross in real value (not nominal value) on the S&P and pointed out a likely decline.
I posted the link, but here it is again:
http://stockcharts.com/h-sc/ui?s=%24spx%3Audn
You'll see that the decline happened a couple of days later.
I still got caught with my pants down because I wasn't using my own advice... but it was a lesson learned.
Basically all the dollar gyrations create false signals, and dividing the S&P by the inverse of the dollar ($SPX:UDN on stockcharts) filters out the noise and gives a truer signal.
Tim