Comment on Acorn

For quick editting, I use Acorn.
For the more involved stuff, there's always GIMP.
GIMP is free and powerful, but I'd always rather start up Acorn.
Acorn crashes here and there, and isn't the fastest with accelerated drawing or large files, but it starts up right way and the interface is perfect.
This arrangement has thankfully taken away the requirement for Photoshop.