Perfect Layers is a new plug-in by OnOne Software that brings layers functionality (e.g. image layers, blend modes, layer masks, etc…) to Lightroom and Aperture. The program is currently
in Public Beta right now available as a 30-day free trial, meaning you can download and try and a free preview version for Lightroom.
Update: Wow, that was fast. Looks like the program isn’t in Public Beta anymore. Instead, you can try it for 30 days or pay $500 for the full suite of programs/plugins.