via http://sebsauvage.net/links/?Q4XiFg

"Ah tiens je ne connaissais pas toutes ces commandes de Minecraft. Je copie-colle ici:

  F3 + c = trigger manual crash (hold for min 6 secconds then release)
  F3 + s = reload sound engine
  F3 + t = refresh textures (might be handy for texturepack artists?)
  F3 + f = decrease render distance
  F3 + shift + f = increase render distance (might not work on mac)
  F3 + a = refresh world renderer (reload chunks)
  F3 + h = toggle advanced item tooltips (item ids and dammage values)
  F3 + b = toggle hitbox renderering
  F3 + p = toggle pause on lost focus
  F1 = toggle gui
  F2 = capture a screenshot
  F3 = show debug info
  shift + F3 = show debug info including the profiler
  F5 = toggle camera view
  F7 (hold) = move the 'display' logic to 'root' (that's all the sence I can make it)
  F8 = toggle smooth camera
  1 trough 9 = select inventory slot
  1 trough 9 = move trough the profiler (debug screen)
  0 = move up a level in the profiler (debug screen)
  esc = open game menu
"