I use adblockplus and it seems to work well. The only drawback is some sites will shut down unless you disable it. http://www.telegraph.co.uk is one of them I can think of.
Yes, that’s true, and I have run across a few sites like that as well.
I just laugh at their whining and then leave. I’m not going to be plagued by adds, and if they don’t like my add blocker, I won’t look at their content either.