Here's the one I know of:
http://bhpr.hrsa.gov/nursing/scholarship/
It appears to be HIGHLY competitive and need based. There's also a loan forgiveness program with them as well.
I recall from an orientation I attended (for a graduate nurse midwifery program) that there are other programs out there to attract advanced practice nurses to serve rural populations, particularly in Appalachia, but don't know the specifics.