While continuing to recommend the stock, analysts at both RBC Capital and Bernstein Research today trimmed both their earnings estimates and price targets for the Internet search giant. That follows similar moves by analysts at Stifel, Morgan Stanley, AmTech and Collins Stewart.

RBC Capital’s Ross Sandler maintains an Outperform rating, but today cut his price target to $500 from $600. For 2008, his EPS estimate is now $19.14, down from $19.45; for 2009 he now sees $21.24, down from $23.46. The move, he writes, is “based on the deteriorating macro environment.” (I bet you sure are surprised to hear that.) He says search is holding up better than other forms of online advertising, but that “no company is immune to cyclical factors.”

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