You can now annotate your own YouTube videos. It’s been possible for a while now but I only learnt of it at an LSE Languages show-and-tell earlier this week. Here’s a good Friday afternoon example:
Update!: Ooops – annotations don’t appear in the embedded version below so you need to watch it on YouTube
See more on this in relation to education over on EdTechie. Keep going to the comments and you’ll see where I found the Wedding singers.