Perhaps my 'Fix Reversed Face Materials'...
http://sketchucation.com/resources/pluginstore?pln=FixReversedFaceMaterials
There are several permutations... put basically... if you have applied UV mapped textures onto the backs of faces that are actually looking in the direction that their fronts should have been , then simply reversing the faces also flips their materials with them: moving their textures to the now 'hidden' backsides: to save you... this tool reverses the faces so their fronts are in the direction they ought to be [looking 'out'], and at the same time it flips their material, so that the front faces now have the textures that were previously on the back, and their UV mapping is also replicated properly; the back material is turned to 'default'...