It does work in version 3.5 when you do the following:
1/ Create a simple text file into which you put your AdSense code
2/ copy that file onto your server so it can be accessed by a URL such as
http://myserver.com/myadsense.txt
3/ Create Custom block for which you specify the content to come from the file specified in step above
4/ Add the Custom block wherever you need using the ViArt CMS
So far it worked on all pages I put it onto, but I have not tried yet pages such as checkout where it might not be advisable... But general pages are fine - have a look at
http://www.delicashop.com
Good luck!
Lubosh