Make a Thumbnail Image in 3 Minutes
Shrink a larger picture down to a thumbnail or icon size.
Perspective Clone Tool will allow you to clone part of an image into the foreground or background. It does this by scaling the area at the same time that you are cloning it.
The Crop tool allows you to Cut off the unwanted edges of your pictures. After that, see how to resize your image bigger or smaller with image scaling.
An introduction on using the Gimp tools main window.
A short video on resizing and moving images.
Press Ctrl+i to import an image. To keep an images aspect ratio, it has to be encapsulated with a Zoom layer.
Shrink the file size of a jpeg picture by lowering it's image quality some.
Get started using Inkscape and creating shapes.
(One mistake in this tutorial- You can snap objects together. To see snapping options, go to the menu View->Snap)
More Rare things to do with Paths.
Text Along Path
Selection to Path
GIMP 2.8 UPDATE:
For text along path, right-click on the text.
Create music album and poster type artistic patterns.
Create fancy patterns as seen on currency or stamps.