For Safari 3 you can now get an AdBlock utility just like the one available for Firefox. The only challenge is getting it installed correctly. And no, the documentation that comes with the Safari 3 Adblock isn’t correct (at least not as of release 2r3). So after doing some digging I found out how to make this tool work in Leopard.
First, download the latest copy at http://safariblock.googlecode.com/files/SafariBlock2r3.dmg
Install it into /Library/InputManagers
Then issue the following from Terminal:
sudo chown -R root:admin /Library/InputManagers sudo chmod -R go-w /Library/InputManagers
After that you should be all set.
My first impressions are that – while page times slow a bit during loading, it seems overall a pretty stable extension for Safari.