AdSubtract kinda thing for linux?

Has anyone seen 'AdSubtract' (www.addsubtract.com).

I want to put something like that on my firewall (linux, of course).

There was noise a while back about killing adverts using the proxy,
but the ability to handle cookies as well (and allow certain ones
and kill others - now THAT's useful till we can get EVERYONE to stop
using the stinking things!)

So, does anyone have one of those already?

rusty