It just doesn't look like a short to me. I don't like to short a stock that has an all time historically volume breaking moment on a big price increase. Take a look at the volume over the last five years, and then look at the last few days.
Also the up move yesterday looks very strong. Palm pretty much went straight up with most of the volume over the initial trading range. We closed on the high and look strong. I would expect to consolidate, but all moving averages are in place and pointing up. Markets are probably due for a bounce as well, so I would be really hesitant about shorting this.
Also it blew past the fifty percent retracement for the last major sell off some months ago, and looks like it will try to test 9 again. If I were forced to be a call or a put tomorrow, it would be a call.
Granted taking the opposite position that I take would give you favorable odds of success.