its interesting to note, that when GOOG was below 200, everybody was crying short and people where convinced GOOG is overvalued. Now more and more people give up shorting goog, others begin to think that goog at market cap 80 Billion is justified and think its another Microsoft that can bring them millions. You can't invest into a company with market cap 80 Billion and think you can make a million out of 10.000 unless you think goog will make it to the world.com company.
You can also see the trend change in the P/C ratio on google. People get tired of shorting it.
So it is my strong believe, that the amuni that drove up this beast (lots of shorts fighting the trend) seems to dry up and GOOG begins to get vulnerable here.
However I would like to wait for 2 things to happen bevore I short it:
1) Stock Split hast to be offiial announced
2) Stock has to be in S&P and add some 2 or 3 days to that date
Just my 2 cents...