Just this morning, I switched over to Mozilla Firefox. One of the extension for it is called "AdBlock", and it's fantastic. You can right-click on any advertisement, and it gives you the option to nuke it. It also understands IFrame ads and can nuke the whole frame. In short, it does everything that I used to love WebWasher for. WebWasher, unfortunately, has been increasingly breaking sites that play fancy JavaScript games. When you've got your ad-blocking built into the browser, it seems to work a whole lot better.
The only other system like this that I've tried is
Privoxy. It does a reasonable job, but again breaks sites that try to play fancy JavaScript games.