Probably, you have heard about Google shares drop on July 20 shortly after they announced Y2007 Q2.
One of the reasons for such "poor" quarter results was aggressive hiring (read "investment in human capital"). This affected the bottom line and the bottom line in turn raised concerns among investors and analysts.
You agree that for hi-tech company like Google humans are most valuable capital. Not technologies, not patents, not buildings or computers.
And to me it is a good sign that a company is investing in its most valuable asset. Or may be I do not get this "Wall Street" thing with shares and stuff?