This isn't hot off the press or anything, but it's a cool and very useful extension. For those of you using http://www.mozilla.org/products/firefox/ download and install these two extensions.
Greasemonkey -> http://greasemonkey.mozdev.org/
direct download-> http://ftp.mozilla.org/pub/mozilla.org/extensions/greasemonkey/greasemonkey-0.3.3-fx.xpi
Platypus -> http://platypus.mozdev.org/
Direct download-> http://downloads.mozdev.org/platypus/platypus.0.4.xpi
After both extensions are installed restart firefox. Now lets head over to a site we visit frequently such as
www.ps3news.com
Right click anywhere on the screen and select platypus! Now you will notice that if you mouseover any part of the site that there will be a pink box around it.. mouseover an ad and press delete on the keyboard... do this until you have the site the way you want to see it. Now press Ctrl +s. a new window will appear with the script code. go to tools-> instal user script, press ok and you're done... reload the webpage and it will be just the way you want it
Here's an exampe:
Before-> http://server2.uploadit.org/files/curve44-Before.jpg
After-> http://server3.uploadit.org/files/curve44-after.jpg