I went looking for a list of YouTube URL hacks so I could send a link to a video and have it start at a particular time. I ended up coming across a couple of great posts that have some neat tricks.

• 10 YouTube URL Tricks You Should Know About
• 10 Useful YouTube URL Tips and Tricks

My favorite two:

• View high quality videos: Add “&fmt=18” for stereo 480 x 270 resolution or “&fmt=22” for stereo 1280x720 resolution.
• Start at a specific time: Add “#t=XmYs” where X is the number of minutes and Y is the number of seconds, like “#t=5m16s” to start at 05:16. If you just want seconds (like to start at 0:14) you can just put the number, like “#t=14”.

Check out the rest of the tips on the original sites - good stuff!