Some information and tools for manipulating key bindings on MacOsX:

• TextMate Blog » Key bindings for switchers
  This entry isn’t just for switchers, but I’ve gotten several requests for making the home/end function keys go to the beginning/end of current line, which is how Windows does it, hence the title.
  (tags: howto macosx keybindings textmate)
• KeyBindingsEditor Homepage
  KeyBindingsEditor is a GUI-based editor for OS X key bindings. It allows for easy editing and supports single-action bindings (one action per keystroke), multi-action bindings (multiple actions for a keystroke) and Emacs meta binding-style multi-keystroke
  (tags: software macosx keybindings keb)