I don’t know how long this has been the case, but onOne’s Perfect Layers is free! This is a plug-in for Aperture that gives you one of Aperture’s most-missing features — layers.
I have the entire Perfect Photo Suite installed, and Perfect Layers acts as the host, or starting point, for any Perfect Software tool you want to jump into. I’ve only had it installed for a short while, as I needed the tool Perfect Resize (which is unbe-freakin’-lievable, and I’ll be writing about that soon), so I can’t actually comment yet on how well the Layers function works. But needless to say, at unbeatable price of FREE, you probably should go download this now.
Anyone with any experience with Perfect Layers, let’s hear about it in the comments!