Blocking Experts-Exchange from my Google results and/or computer

Tip of the day: Scroll all the way to the bottom of their pages to see the unhidden answers...

You can use this Greasemonkey script to block it from Google search results. Greasemonkey is an add-on for Firefox which you can grab here.

The CustomizeGoogle Firefox extension allows, among other things, to filter websites from the search results. It's one of the things I miss the most about FF.