I had the same problem as Amanda for the longest time. When I finally asked about it earlier this year, noone seemed to know what I was talking about. But I did manage to find a solution (
http://www.gimptalk.com/index.php?/topi ... s-resizing) to the resizing issue. First get all of your windows open and sized to where you want them. Just remember that when you open an image, the main window will expand from the Top-Left corner. Go to Preferences->Window Management, untick "Save window position on exit", then press "Save Window Positions Now". Close Gimp. Now go to your user folder, something like "C:\Documents & Settings\Your User Name\.gimp-2.6\", and find the sessionrc file. Right-click on it, go into properties, set it to "Read-Only" and apply. Tada, now everytime you open Gimp its the same size, and in the same place. I still haven't figured out how to keep the occasional script from opening behind the current window, but DeskPins that Rod linked to is supposed to work well.
Here's the setup I use, with the Toolbox placed so that if I maximize the main window, I can still get to both scrollbars. Not perfect, but it works well enough.
