It’s been some time since I did my last models 
and I lost sight of this feature. The last time I packed a Cycles blend file, the textures could not be packed in the same blend file for the rendering to work. Is this still true?
You could just easily try it and see if they work or read the blender 2.66 release notes http://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.66/Cycles#User_Interaction