YouTube has quietly added a visual "related videos" feature that, while not as efficient as smart text searching, does help you find videos in the same realm as the one you're watching. To enable the feature (which doesn't appear on all videos), click the full-screen button on the lower right corner of the video. In the full-screen window, click the network-type button next to the play button. It functions similar to Musicovery in its methods—and probably in its potential for procrastination, so beware. For more non-standard YouTube search options, check out VDoogle and Qooqle.
YouTube Adds Visual Search Tool
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