Some real good tips for embedding higher quality YouTube videos on a web site can be found at this link:
http://howto.wired.com/wiki/Watch_Higher_Quality_YouTube_Videos
There are several methods, but this one seems to be good for quickly modifying older posts
Add &fmt=18 to the URL of the video and it will look for a higher resolution version, if it is available.  [...]

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The pace of change in the content world is picking up thanks to the underlying forces of technology that is driving content distribution and advertising models.  Unlike their peers in the music industry, the video producers and content owners represented at the National Assocation of Television Programming Executives get that the world is changing and [...]

Popularity: 8% [?]

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addthis_title = ‘A+Test+Live+Blog’;
addthis_pub = ”;

Popularity: 6% [?]SHARETHIS.addEntry({ title: “A Test Live Blog”, url: “http://viodi.com/2008/01/25/a-test-live-blog/” });

Popularity: 6% [?]