This finder thing is something that is "new" to OS 10.5. You can, once you have a finder window set the way you want make it stay that way, but you have to specify that you want it that way. Once you have it the way you want hit command+j. This will bring up a window that will allow you to specify how you want the stuff displayed.
Personally this is one of the things that i hate about 10.5. In 10.4 and down this process did not have to be done. When you changed the look of a window it would automatically update the ._DStore file that these values are put into. When you changed the view back and forth it wold change it accordingly. But now, unless you specify how you want the folder, it will go to the default view on next "launch"