One predictable chart pattern to short sell is an over-extended run followed by a red (loosing day) that prints a shooting star candlestick. I circled the shooting star in the chart. By an over-extended run I mean a stock that gains over 50% or more over about 5 days. The classic setup is when it moves that much and also finishes above the upper bollinger band. A breakdown from the previous days low is a great short sell entry. CDTI was an almost textbook example of such a setup.
Crude Oil
I have a buy stop set for Powershares Ultra crude Oil UCO at 29.75.
disclosure: no position in CDTI