This is really light-weight module. It does not support full featured of YAML, but it has no dependency with other modules, so it is really easy to embed your script or to use with App::FatPacker, etc... I usually embed this module into my script with App::FatPacker and support YAML features without other module dependency. ;-)
We needed such module for some time. Even that if has a small incompatibility with YAML now, its highly usable with good docs, the right API and an tight and concise written code, that can serve as good example for similar modules.