
Here is a rather nice webquest on London which I used recently with my pre - intermediate students. It fits in well with many course book contents, and can also be used at Intermediate level.
A blog for Teachers of English as a Foreign Language.

Fraction dominoes
A favourite activity of mine is called Act 3, and I must say I have used it so many times I have lost count! It is based on the popular children´s game: Kim´s Game, and really is very good for students who have a good level of English...and also a fair amount of creativity. 
PS: You may be interested to see Mariah Carey´s reaction to this video. You could get your students to think about how she might react:
http://www.youtube.com/watch?v=mnlSLN63Loc