You can use the HOSTS file in Windows to prevent banners from displaying in web pages. It is usually in c:\windows\system32\drivers\etc. Note that it has no file extension. There are a few good sample files online that contain thousands of known advertisers. I use http://everythingisnt.com/Hosts as a reference. If that link is down, use my mirror copy (29 k). The way it works is by redirecting the url (e.g. ad.doubleclick.net) to your own computer, instead of the proper doubleclick.net server. Your local web server (if you have one) won't contain any of banner images or pages requested and you see a 404 page not found in the browser in place of the banner image / web page.
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