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When I was first starting to use GIMP as a image editor it was full or pwerful features and for free. I was messing around and what I really needed to do was remove the white backround from images and make it transparent so I could use it in multiple instances on a website with different background.

This is a very simple approach and I am sure there are others, but this is how it do it:

1. Open up the imgae using the GIMP editor
2. From the menu select Layer -> Transparency -> Add Alpha Channel, You will notice that nothing happens, this is ok, it adds  transparency information to the layer
   1. Some images I find that Add Alpha Channel is greyed out, so use Delte Alpha Channel then redo the above step
3. Now, go to Select -> By Colour, then click on the white background in your image, you will see that it has selected all the white background area
4. To remove this and make it transparent, all you need to do is Edit -> Clear, you should now see that where the white background once was is now the grey tiles which show you it is transparent
5. Now Save your image

Any issues, or further suggestions, please let me know

Here is a screen movie of a simple task: