I have integrated the Fretboard tool into the site and you can now create and save Fretboard Diagrams to your account!  You will need an account for this, and I will keep the other version available for those that do not want an account.  All of the instructions to use the tool are included on the page, just visit the Fretboard Tool, or click on the "Fretboard Diagrams" menu item on the top right when you are logged in.