Bukkit

As of 4.0, the default config file looks like this:

Detonate:
  Size: 1
Annoy:
  AnnoyOp: false
Curse:
  CurseTime: '120'
  CurseLevel:
    Weakness: 2
    Slowness: 2
    Confusion: 2
    Blind: 2
Banish:
  WorldName:
    Nether: world_nether
    End: world_the_end
    Normal: world
Update:
  Check: true
  Notify: true

Explanations

Detonate.Size

• The explosion size for /detonate. The bigger the number, the bigger the explosion!

Annoy.AnnoyOp

• Whether you can annoy a player who is op or not. Set to true if you want to be able to annoy them!

Banish.WorldName.*

• The World name for the specified area. This HAS to be correct in order for /banish to function fully!

Update.*

• Update.Check: Whether the Update Checker checks for updates or not. Set to false to disable it.
• Update.Notify: Whether the Update Checker notifies players or not. Set to false to disable it.

Curse.Cursetime

• The amount of time (in seconds) that the curse will last.

Curse.CurseLevel.*

• The level for a certain type of curse.