Watching the "Making of" of various music videos I noticed these kind of on-camera ring lights multiple times.

http://img167.imageshack.us/img167/1964/afbeelding2cp3.th.png (http://img167.imageshack.us/my.php?image=afbeelding2cp3.png)
(Click to enlarge)

I was wondering how these type of lights are called, as it seems a nice solution for some purposes?

ps. Pardon me if my English isn't that well: I'm Dutch. :)

They are called "ring light", so you're already there! Kino Flo makes them.