GIMP Tip! Don't stroke the selection, stroke the path!
pixelmove.com
This GIMP tutorial shows you how stroking the path gives you much better results then stroking the selection.
Stroke the path!
It also shows how to make a selection into a path.
September 2009
GIMP Basics 4 – How to Crop and resize an image
This Gimp tutorial teaches you how to do simple cropping and resizing inside of GIMP. Using the crop tool in GIMP and resize or scale in GIMP. Easy when you know how.
GIMP Basics 2 – troubleshooting – When tools don't work – Better sound quality
In this video I’m showing you some tips of what you can do when your tools don’t seem to work correctly or when they don’t seem to work at all. And also how to fix things when the menu item you want to use is greyed out.
Of course these tips won’t solve everything but they will solve the most comment beginner problems.