PE is not a good measurement in this current state. Fundamentals DO NOT matter in the short-run. However, I also suspect there will be a bounce next week as shorts cover and as bailout plans begin to take some effect. However, the market will likely continue to fall after that.
Although % of float is a consideration when you're playing the short squeeze, what's an even better indicator is the days to cover. If a stock has a short 30% of float but only a few days to cover, the effect of the short may not be as pronounced as if the days to cover are much longer.
The Case for a Bounce [View article]
Short Interest at Record Levels [View article]