I found this on the Burn the Fat Inner Circle forum from a regular contributor, John Sifferman.  I’m posting here so I don’t forget about it for future reference.

The plank routine exercises are:

1. front elbow plank (FEP)
2. FEP w/ right arm elevated
3. FEP w/ left arm elevated
4. FEP w/ right leg elevated
5. FEP w/ left leg elevated
6. right arm and left leg elevated
7. left arm and right leg elevated
8. right side plank
9. left side plank
10. right side plank with leg up
11. left side plank with leg up
12. top of pushup position (TOPP)
13. TOPP w/ right arm up
14. TOPP w/ left arm up
15. TOPP w/ right leg up
16. TOPP w/ left leg up
17. TOPP w/ right arm and left leg up
18. TOPP w/ left arm and right leg up
19. right side plank, elbow locked
20. left side plank, elbow locked

Again, thanks to John Sifferman for the great routine.