I thought I'd share with you a video I made, on how to make The GIMP look similar to Adobe Photoshop's default layout.
The GIMP's default layout is not very good and for the most part, people will most likely come from using Adobe Photoshop, like I did many years ago. The GIMP comes with most Linux distros and there is a Windows version. More info here http://www.gimp.org/
Here is a link to my video http://www.youtube.com/watch?v=5Yeuf_vxsy4
I hope it's useful to you.