I have had an xbox slim for about a week now and I have noticed that the xbox gets very hot over the fan on the top of the xbox. I have my xbox vertical and most of the xbox is cool but the fan on top is Hot - Nearly hot to touch. I have the gloss version.
Now, I'm thinking this is a good thing because it means it's getting rid of all the heat in the xbox and releasing it through the vent but I may be wrong. I'm getting a bit worried because my friend said he has the exact same model and his is blowing out cool air. My room is pretty small and it gets hot in it so maybe that is the problem?