PointsHound is starting the 2014 with 14 partners, as the hotel booking service had launched partnerships with both Frontier and Alaska.
The PointsHound is offering 1,000 bonus miles for a hotel booking of 3 nights or longer that is booked by January 31, 2014. This is in addition to the regular miles you earn.
You will also earn 250 bonus miles for signing up for the service (here), if you are not yet a member. There is no promotional page for this offer, but you can see the bonus at the time of making the booking.
PointsHound has far greater number of hotels bookable using its service compared to RocketMiles and some of the rates (clearly marked) will qualify for stay/night credit and points on hotel loyalty programs.