Personally, I like to try and ensure a unedited straight from camera shot where possible - it's nice to show you have technical and compositional skills.  

I will occsaionally crop for effect, at the most adjusting gamma/colours (like with my recent aerial shots) if the photo has come out bad, and using the clone brush to erase people. 

Though I do think modifaction to an image for artistic effect is legitmate, as long as you are honest about if anyone asks.  

Pinky - you left the lens cap of your mind on again.