An analysis by ClickZ speculates that the recent acquisition of iProspect by Aegis may portend a trend of ad agencies snapping up search marketing firms to purchase expertise they have been unable or unwilling to create in-house. Also named as potential acquirers were the larger of the pay-per-click networks, such as ValueClick. Companies interviewed indicated the larger search firms, like Did-It, DoubleClick and Fathom were by far the more attractive targets.