There are neuropsychiatry residencies, although they are becoming less and less. Some have lost accredidation due to the seeming lack of integration of the two fields, as opposed to simply being double boarded in neuro and psychiatry.
The remaining programs are:
Univ. of Arizona
Univ. of Miami-Jackson Memorial
Indiana Univ.
Tulane
Univ. of Mass.
NY Presbyterian Hosp (of Columbia)
NYU
Brown
West Virginia Univ.
I very strongly considered entering a neuropsych program, but ultimately decided against it for a variety of reasons...mostly the time factor. It's significantly longer than either psych or neuro alone, and while I feel that the added knowledge is wonderful in your approach to patients, I simply had to make the decision to be a psychiatrist with a strong background in neurology. As a psychiatrist, you are boarded in neurology, but should generally not be treating stand-alone seizure disorders, etc. You can treat neurological problems in the context of psychiatry, but must decide if the added education is what you want. In working with a few neuropsychiatrists, I've heard mixed reviews, about half said to do it, the other half said it wasn't necessary unless you had a burning desire to see stroke, seizure, syncope, neuropathic pain, musculo disorders, etc. You can make significantly more money if you slanted your practice that way, but there are great ways to make money in psychiatry as well.
Good luck.