YAML - The Bad * Started in April 2001 (over 8 years ago) * Still not rock solid * JSON was 2005 and quickly solid * Many Incompatible Implementations * YAML.pm, Syck, XS, Perl, Tiny * Very complex specification * 1.2 specification is not released yet * No implementation (not even libyaml) fully matches the 1.2 spec * Terrible vim syntax highlighting