Useful plot kernals

http://en.wikipedia.org/wiki/Aarne-Thompson_classification_system 

The system is useful because of all the detail it contains. 

E.g. (a short excerpt)

• 1 Background
• 2 Hans-Jörg Uther
• 3 Criticism
• 4 Types
  • 4.1 Animal tales
    • 4.1.1 Wild Animals 1-99
      • 4.1.1.1 The Clever Fox or other animal 1-69
      • 4.1.1.2 Other Wild Animals 70-99
    • 4.1.2 Wild Animals and Domestic Animals 100-149
    • 4.1.3 Wild Animals and Humans 150-199
    • 4.1.4 Domestic Animals 200-219
    • 4.1.5 Other Animals and Objects 220-299
  • 4.2 Fairy Tales
    • 4.2.1 Supernatural Opponents 300 - 399