In the movie Oceans Twelve, there is an upbeat musical piece toward
the end of the movie, where the young French, wealthy thief tells
Julia Roberts and George Clooney (on his patio) how he stole the art
work.  The fast-paced, arabic souding musical piece then starts as the
scene shows the French thief dodging random lazers.  I went out and
bought the CD, only to find out it's the only musical piece in the
movie not on the CD.  Please tell me the name and artist of this
musical piece. Thank you!

Hi bab30,
 
The song is called "Thé ŕ la menthe". It is by a French hip-hop group
called "La Caution", written by a member of the group called
"Nikkfurie". It is on the album "Sounds Of Kourtrajmé".
    
The song can be downloaded from http://www.kourtrajme.com, (site is in French). 
Here is a direct link: http://www.kourtrajme.com/thealamenthe.zip
   
The song is also on the CD that comes with this double DVD set:
http://www.justlikehiphop.com/fichemenu.php?id=1597&PHPSESSID=47ff6afb3528a80522a7a805a1f161e7
     
Sources:
http://www.radiomute.com/musicthread18211.html
http://www.musicbanter.com/archive/index.php/t-4041_From_Ocean%27s_12.html
http://www.diyaudio.com/forums/showthread/t-55528.html
http://vnarayen.blogspot.com/2004/12/la-caution-th-la-menthe.html
   
Search terms used:
"oceans twelve" music end
"oceans twelve" "la menthe"
"Sounds Of Kourtrajme"
Sounds of Kourtrajmé

This answer was so incredibly thorough and so quick. I love the links
provided to websites.  I had no idea how to find this answer on my
own.  Thank you so much!!!!!!!!!!