Boris Achour did an art Defacing video for La Force de L’art 2009. You can see this video here. I visited this exhibition back in 2009 and here is my walk.
The Black Keys do some explosive art Defacing in their Brothers album promotion. Funny… See below:
Mutemath use some art Defacing illustration for their album Odd Soul. Check out their experimental visual stems mixer here.
Lucian Freud exhibition at Centre Pompidou is solid… see it here via vernissagetv
[podcast format="video"]http://blip.tv/file/get/Henrichy0205blip-LucianFreudRetrospectiveAtCentrePompidouParis648.mp4[/podcast]

Martijn Hendriks, In the black of this long night, 2008. Installation view. Attempt to organize Google Image Search results according to defacement tactics Jpeg slideshow transferred to DVD, projection, 15 min 20 secs loop.
Martijn Hendriks does some digital defacing and comes to you via Art Lurker
Here is a small clip from the exhibition Portraits d’Amies at the opening reception on September 11th 2008.
[podcast format="video"]http://www.pablogt.com/podcasts/MirelaPopa.m4v[/podcast]
Video by Françoise Ellong & David Wolfer