Wordia is a free online video dictionary where "real people" define words. You can watch - or make and contribute - videos, which the editors go through to select to provide a "word of the day". The videos are uploaded through YouTube, but cannot be embedded the way YouTube videos can, or downloaded through www.savevid.com. But if you do a search on YouTube with the name and the word, you'll find the video you want. I really enjoyed watching Scotswoman Jenny Colgan defining "expatriate". Gin at 10 in the morning?
The site claims:
"We're redefining the dictionary.
1. Think of a word that has a special meaning for you.
2. Record a video defining the word
3. Upload your video."
I might want to define "Weißwurst" ;)
The team running this project collaborates with HarperCollins, The National Literacy Trust and The Open University, among others.
Found through Nik Peachey's Wallwisher wall, "Web 2.0 Tools for teachers" - a must-see collection where you can add your own favorites.