I kind of feel stupid, but I just can\'t get it to work....
I have an existing Android project copied from my other pc, in the folder
c:\\projects\\t
It's the "Import existing project into workspace" option under Import->General.
See: http://help.eclipse.org/helios/index.jsp?topic=%2Forg.eclipse.platform.doc.user%2Ftasks%2Ftasks-importproject.htm