Allvideos Reloaded (AVReloaded) is a really nice piece of software engineering from Fritz Elfert. Rather than hardcode for all the individual players out there, Fritz created a macro system that allows you describe the parameters for any player, so it can be configured and updated.
Click for screenshot of Google Analytics Event categories, generated by the Longtail GA Pro plugin
Like the Allvideos plugin, AVReloaded comes bundled with the ubiquitous JW Player for Flash. If you are streaming flash movies from your website, one worthwhile plugin is longtail's Google Analytics Pro. The current license price for the plugin is $19 from longtail's site. If you're already using Google Analytics, the plugin feeds "Content" events from the player to Google Analytics which will show up under the "Event Tracking" menu. Ever have questions like: "I wonder what videos people are actually watching on my site" or "for this new video, how many seconds do they watch before they get bored and close it?" If so, then this plugin is for you. The player will generate events that GA groups into 3 categories: "Video Plays", "Percentage Played" and "Seconds Played". Drilling down you get a nice list of the Videos on your site. For example, finding out that people only watch on average 10% of that promotional video for your product is probably a sign that you may need some better material.