  We report the detailed history of spin-period changes in five intermediate
polars (DQ Herculis, AO Piscium, FO Aquarii, V1223 Sagittarii, and BG Canis
Minoris) during the 30-60 years since their original discovery. Most are slowly
spinning up, although there are sometimes years-long episodes of spin-down.
This is supportive of the idea that the underlying magnetic white dwarfs are
near spin equilibrium. In addition to the ~40 stars sharing many properties and
defined by their strong, pulsed X-ray emission, there are a few rotating much
faster (P<80 s), whose membership in the class is still in doubt -- and who are
overdue for closer study.
