shutup.css
shutup.css is a custom stylesheet that can be applied to your browser to hide comments on many popular websites.
Installation
Safari user? For best results, use the Safari Extension below...
Google Chrome user? For best results, use the Chrome Extension below...
Firefox users may wish to try the Stylish plug-in.
For other browsers:
Download the auto-updating shutup.css file to your system.
(If you don't trust a remotely-imported CSS file, or want to make customizations, you can download the source directly instead.)
In your browser's preferences, configure your browser to use shutup.css as a custom user stylesheet. In Safari for Mac OS X, it looks like this:

Enjoy a less comment-y web.
If you make changes, or download a new version of shutup.css, quit and restart your browser to make sure it takes effect.
A list of known-to-be-affected sites is contained within the stylesheet itself.
Warning
The stylesheet blindly hides blocks with IDs like "comments", which could have unexpected side effects. (I'm told it hides the "discussion" section of Bugzilla installations, for example.) Disable shutup.css if you think you might be missing important page content.
Safari Extension
Safari users enjoy a seamless experience by using the pre-packaged Safari Extension by Ricky Romero. It adds a toolbar button which allows you to toggle the stylesheet on and off on-the-fly:
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The Safari Extension is by far the easiest way to use shutup.css with Safari. It's even auto-updating!
Chrome Extension
Ricky Romero's extension is also available for Chrome.
Bookmarklet
Justin Ridgewell provided a bookmarklet to activate the stylesheet on-demand, rather than all the time. Drag it to your browser's bookmark bar:
Contributions
The easiest way to make an addition or correction to shutup.css is to send me a pull request on GitHub.
Contact
You can contact me at stevenf@panic.com
Thanks for your assistance: Cabel, Neven, Tim, Ricky, and others!