A screen resolution of 800x600 or greater is also recommended.
On systems before Mac OS X, you might need to adjust the amount of memory given to DragThing from the Get Info window in the Finder. The default setting is a little more than most people will need, so adjust it as required.
If DragThing runs out of memory, it will suggest you increase the memory allocation and give you the opportunity to quit. The next time DragThing is opened, it will ask you if you want to check the Preferences file for any problems.