Here's the second part, to get greasemonkey to work:
After you have both downloaded and installed, you should see a little monkey in the lower right hand side of your browser. Right-click him, and select "Manage user scripts"
Under "included pages", click the "add" button. and copy-paste this:
http://www.wrongplanet.net/modules.php? ... viewtopic*
then select "ok", and select "ok" on the "manage user scripts" page.
Now load any page on WrongPlanet. When you view posts, you will see an "x" beside every persons user name. If you want to block someones posts, click that x, and then refresh the page. After refresh, their posts will be gone
Be sure mind them to have a check next to "enabled"
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Please note that the above was written by Immortal, my deepest gratitude goes to her for her help with this.
By the way, I have asked that this thread be stickied and locked, so no need to have a discussion about whether or not this is a useful thing or whatever, and we don't want the thread to get hidden underneath all the new topics.