1. install eclipse + pdt
2. run eclipse, select menu "file > new > project..."
3. select "CVS > Projects from CVS"
4. set following options, and then click next
Host: us.cvs.moodle.org
Repository path: /cvsroot/moodle
User: anonymous
Connection type: pserver
5. select "Use an existing module". Wait a moment, then select "moodle" from the list. Click Finish.