Starting from version 3.5, Konqueror feature an ad blocker mechanism based on regular expressions. Here is a little how-to to help you install an efficient filter set.
Then go to
AdBlock Filterspanel (the one on the screenshot).
Hide filtered imagesoptions.
Import...button to load the “Filterset.G” file you previoulsy downloaded
Enjoy ad-free web sites !
By the way, I hope to see the feature suggested by Andreas Frische to get some attention by the Konqueror community: it would be nice to have an integrated auto-updater of filter set in Konqueror (and make this how-to deprecated).