Firefox Add-On: LeechBlock - simple productivity tool for time-wasting sites
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I stumbed across LeechBlock. I installed it @ work to help me stay more focused and not get distracted on the web. So far it works great for me. Check out the link for more info and pics. "LeechBlock is a simple productivity tool designed to block those time-wasting sites that can suck the life out of your working day." - from LeechBlocker's Firefox Add-ons page