Internet Search Blocker/Filter

I did a search for "internet filter" and found nothing, and I think this could be considered as software... I'm looking for an internet application that can block websites, especially pornographic ones. Of course I am aware of the parental controls option in my System Preferences, but I'm the only one who uses my laptop, so that makes me the system admin. The system admin can't put parental controls on "him/herself". That's my problem. I already tried "If2k", but I had a lot of error messages with that.

Anyway, like I said, I'm looking for a good application for internet blocking.

Thanks.