March 3 - 3:00pm EST   Google's primary video site YouTube is quietly increasing the quality of its videos, viewers have found over the weekend. The Flash-based site has begun re-encoding the web versions of its videos when possible, increasing their resolution from 320x240 to 480x360. Audio quality has also improved to include stereo AAC audio versus the lower bitrate mono sound of before, users note. The improvement primarily applies to newly uploaded videos, which are automatically produced in both the regular and high-quality versions, but is also being applied to older videos. The extra quality currently remains optional and must be activated by adding a tag to the address of the ... [full story]