There are cases where questions get asked on StackOverflow, and probably are better off on ServerFault. I often times add a comment saying such, but I think it would be nice to have the ability to community vote on that, and if X number of people agree, that it gets moved over automatically. This would work similarly to voting to close or re-open a question, and would therefore require a certain reputation in order to do this.
I searched around on Meta, and haven't seen anything similar to this being asked.
As per the answer below, this is already a feature, but if you look at the SO FAQ, you will see that this is not listed as one of the things that you can do in the Reputation area. I looked at that list, didn't see anything, and so I thought it was not a feature. Perhaps the FAQ needs to be updated. I also don't see this in the Meta FAQ either.