Did I say securitywise ... almost every otherwise as well - only miss addblock & flashblock ... ah wellFlashblock in Opera
(paste the red text in the address bar,run and tick the box).
As for adblock the new Opera 9 has that build-in (named "Content Block"), not as flexible as the Firefox equivalent as it doesn't support regular expressions but it gets the job done.Here
are some generic rules to add to urlfilter.ini and here
are specific ad servers also for adding in urlfilter.ini.