Extract is a Mac OS X app to take a chunk of html and load it in it's own mostly chromeless window. Ideally built for loading embedded flash video in it's own window. Read the introductory blog post for more info and to see a short screencast.
To simplify the usage of Extract, I've created a bookmarklet to load content directly into Extract. Drag this Extract bookmarklet link to your bookmarks bar. On any page that has content you want to view
in Extract, just click the bookmarklet and click the content you want to watch.