I found a good, easy, and free filter add-on for the Firefox browser (versions 2 and 3), called ProCon Latte. You can specify key words both in the body and in the URL which cause it to block a site. So if you type in the URL in the block list, that blocks the site. Plus it can block sites containing specific words. Plus it has a "white list" so you can keep some web sites unblocked. Granted
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