The 1st example uses YouTube to host the video:
Note: this video is http://www.youtube.com/watch?v=fAlMomLvu_4
The 2nd example uses jwplayer.js and Longtail's semi-free player.swf
(JW Player 5.9).
This div should have been replaced (by jwplayer.js)
The 3rd example uses swfobject.js 1.5 and mpw_player.swf, following
this example.
(GS Player is apparently
similar to MWP Player, and might be newer/better.)
Note that I'm using swfobject.js version 1.5, because that's what the example used.
Substituting swfobject.js version 2.2 will not work without modification:
This div should have been replaced (by swfobject_1p5.js)