Link to a specific part of a YouTube video

www.mattcutts.com/blog/link-to-youtube-minute-second/

What if you want to force HD playback when linking to a Youtube video?

Simple.  All you need to do is to append the following after the url string. So, instead of http://www.youtube.com/watch?v=1EutKrKTfLk, you would have http://www.youtube.com/watch?v=1EutKrKTfLk&fmt=

• &fmt=6 – increases the resolution from 320×240 to 448×336, Flash 7 video @ 900Kbps; audio @ 44.1KHz 96Kbps Mono CBR.
• &fmt=18 – increases the resolution to 480×360, H.264 video @ 512Kbps; audio @ 44.1KHz 128Kbps Stereo.
• &fmt=22 – increases the resolution to 1280×720 (720p), H.264 video @ 1024Kbps; audio @ 44.1KHz 232Kbps Stereo.