travelin_cat - 3:05 pm on Jul 2, 2009 (gmt 0) and
From the YouTube blog [youtube.com]:
We're happy to announce that the size of standard uploads has doubled from 1GB to 2GB. The increase means you can upload longer videos at a higher resolution as well as large HD files directly from your camera.
To share a link to the HD version of your video, simply append &hd=1 to the end of the URL. This means the video will start playing in HD as soon as someone follows the link.