Here are those links.
Very interesting and in-depth materials pertaining to M/F spanking relationships
A good place for spanking personals. Similar spanking ad sites are linked from that page as well.
Sensual spankings, the physical processes explained in a technical nature.
Sensual spankings are also explained here.
Didn't have time to look over this one.
Support groups from Laura's Spanking Corner
Finally the most popular site out there, and with the most links dealing with the subject