Due to a new external harddrive, I needed to switch my workspace from one disk to another. Eclipse Ganymede under OS X 10.4 doesn’t reckon the switch correctly if you deleted your old workspace from your old harddisk completly. For example, I moved my stuff from harddisk FELIX to harddisk ANDREW and deleted the workspace on FELIX. Eclipse failed to ask me where the workspace dissappeared, since I once said that Eclipse shouldn’t ask me again. And then it closes, without even showing the error message more than 3 seconds. Well. Bad. 
Solution is to edit the following file:
$ vi configuration/.settings/org.eclipse.ui.ide.prefs
Just switch:
SHOW_WORKSPACE_SELECTION_DIALOG=false
to:
SHOW_WORKSPACE_SELECTION_DIALOG=true
and the workspace selection dialog should appear again. This gives you the option to choose another workspace.
