A good example of the kind of compositing about which Lev Manvich speaks can be seen in Michel Gondry's work, here Kylie Minogue's video "Come Into My World". Here is a link:
http://www.youtube.com/watch?v=cUueEVXw7ec
A broader spectrum of Gondry's work can be seen at:
http://groups.imeem.com/p2bckMJc,michel_gondry_group/
Another great complement to Lev Manovich's "The Language of New Media" is Mark Rappaport's "From the Journals of Jean Seberg". The movie is available at Green Library at Stanford. Here is a link to a review: