Gimp with task-based interface customizations
A few thoughts:
1) Great for tutorials... If it only had examples to go along with the steps.
2) Horrible for actual usage. The search and selection take up way too much screen real estate, and the step-by-step box is even worse.
3) Since it's not in the official client, you have to rely on them to bring in all the official updates. It would be better if this were somehow a plugin instead.
This is the kind of stuff that Gimp needs instead of playing catch-up with PS.
Good idea.