Collected Knowledge
Preface
Bill from Belize has made a text about the workflow for editing a photo in GIMP. This is of course only a recipe, no set of rules and open for discussion and change.
I have started to translate this into a Wiki. It's open for everybody who cares to create an account.
If you create an account and are a forum member, please use your forum user name. And if you are paranoid (or careful, depends on POV 
) use a different password. Real names are not mandatory. Your IP and browser data are logged by the Apache server.
General topics
* Tools of the Trade
Which program to use for which task.
* Build Gimp & Co yourself
General instructions to stay on the edge of development
* Building on Debian
More specific steps to build on Debian and derivatives (especially Ubuntu).
* Installing Gimp plugins and scripts
Where to and how to install additional Gimp plugins and scripts.
* Image File Formats
What and how to store the images.
* Layers
separate individual changes into an unit
* Selections
Limit the area of changes
* 8bit vs. 16bit
what's all about this ranting?
* Recording Screencasts
Some hints about how to record your own screencasts.
Workflow
Preparations
* Import the Images
First, you have to get the photos out of your camera.
* Separate the images
Which images are worth your time and which aren't?
* Critique the Image and Create a Plan
Take a good look and decide what to do.
* Work on a copy
Never use the original file(name) for editing.
* Prepare the edit
Decide what to do and set up the Edit.
Post-Processing
* Rotating the Image
Put those lampposts back upright.
* Correct Tilted Images and Slanted Buildings
Iron out these falling lines.
* Whitebalance
Get the right mood for the shot
* Noise
Can't always be avoided, then it must be reduced.
* Color, Light & Contrast
Get the colors right.
* Remove Objects and Unwanted Marks
Sometimes there's something in the shot that just has to go.
* Dodging & Burning
Not always but in many cases a missing fill flash can be compensated for.
* Change the Image Size
Change or modify how large the image is.
* Sharpening
Photos always need to be sharpened.
Finishing
* Save the Image
Making sure the image gets on disk.
Batch Processing
* Batch Processing
If a number of standard operations is to be done on many images, there's usually no need to do it manually.
Technical Background Topics
* Aperture
* Black & White
A memento of the good old days of Photography.
* Filters
Not everything can be covered with the Filters menu.
* Dynamic Range of Light
The limits on what you can capture
* High Dynamic Range (HDR) Images
More light and darker shadows combined
Photography
* Specific photographic topics
General hints and guides for some standard photography situations
* Using flash
Briefly illuminate the scene
* Panoramas
Combine several images into one scenic view
* Moving Pictures
An image tells more than a thousand words. A video tells more than a thousand images?
