There are a lot of options that are modified by the plist mechanism ("defaults write ..."). They tend to be little things of a very unixy character that seriou

There are a lot of options that are modified by the plist mechanism ("defaults write ..."). They tend to be little things of a very unixy character that serious nerds would like. It makes about as much sense as changing a .login or .profile or .ssh/config or .emacs or .exrc or .Xdefaults or ... . At least it's always the same tools and the same file format. Like you, I don't remember the screenshot shortcuts. I know vi and emacs bindings backwards and forwards, but I don't much like remembering special-purpose bindings. So I just use "Grab", the screenshot app (comes standard with OS X). Grab saves in .tiff. If you want .png, just use: defaults write com.apple.screencapture type png ;-)