There are lots of uses for online videos, especially when you want to show and not just tell via picture rather than word – and YouTube is not the only game in town (at least in the librarian “town”).
Jason the Content Librarian presents a pithy comparison of YouTube and blip.tv in his Oct 8th “Exploring Internet Video Resources” post.
Tip of the day: there are always other games in town just as there are always other fish in the sea (figuratively speaking that is – I can’t promise this in real life)