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YouTube's highly-addictive Related Videos feature is becoming part the embedded players on external websites. Now, all YouTube players embedded around the web include a "related videos" section that looks identical to the Mac dock, complete with magnification and reflections. Ratings are also within the player, as well as next and previous buttons. Yet again, this move will dramatically increase sky-high number of YouTube videos viewed daily.
Metacafe has a similar feature, but last time I checked, it opens videos in a new window, not the player itself.
See the embedded clip from Australian comedy news show Chaser's War on Everything to play around with this. And yes, it is YouTube overkill today - I blame the editor.