How/Where can I configure Eclipse (3.1.2) to use my existing local
installation of the Java 2 SDK docs instead?
Open your Package Explorer, right click on the .jar library
you want to modify (something like foo\jre\lib\rt.jar),
select Properties from the menu. You should now see a dialog
asking for the Javadoc location that has a default value of http://sun.com. Click the Browse button to point to your
local drive paying mind to the note about "package-list".