Google Inc.'s (NDAQ:GOOG) buyout of DoubleClick Inc. is fueling speculation that there may be consolidation in the online advertising sector. Online advertising companies aQuantive Inc. (NDAQ:AQNT), 24/7 Real Media Inc. (NDAQ:TFSM), and ValueClick Inc. (NDAQ:VCLK) all moved up significantly on the news after investors and analysts suggested that they could become the next buyout targets. Meanwhile, others suggest that large players will likely seek more reasonably priced companies in the private sector instead of going after any of the larger public targets. Regardless, these are definitely stocks to keep a close eye on following Google's blockbuster acquisition!

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