Silicon Valley's old guard is waking up to the fact that the era of consumer PC  may be in its twilight, accelerating the need to invest and adapt to rapidly  changing tastes.
 This week's Link Removed from the giants of  technology had one thing in common: they underscored yet again how consumers are  increasingly shunning desktop PCs and going mobile.
 Intel, which had argued that pessimistic expectations about the market were  out of whack, reduced its 2011 PC forecast. Microsoft Windows sales, that  reliable indicator of PC market strength, fell short of expectations for the  third straight quarter.