Ok, I finnaly figured out a way to do this.
1. First, you need to display your entire collection on one page, if you have more than the standard 25 disks per page you have to use the "&max=" with a number greater than you disk total. For example, if you have 235 disks in your collection, just add "&max=250" at the end of the url and you'll get all the disks listed on one page.
2. Then highlight all the disks in your web browser and "copy and paste" into the
duplicate finder here.3. It will give you a list of all duplicates that you can easily copy and paste into any document.
I basically used this method to post all my duplicates onto a craigslist add. Here is the output of the first 5 lines as an example:
LV 32365-WS Naked Gun 2 1/2, The: The Smell of Fear (1991) LBX/SRD 1991-12-18 NTSC USA 3
LV 1621 Star Trek III: The Search for Spock (1984) P&S/SRD 1985 NTSC USA 2
LV68901-WS Total Recall (1990) LBX/SRD/THX 1994-11-23 NTSC USA 2
12682 Blade Runner: Director\'s Cut (1992) LBX/SRD/CAV 1993-05-19 NTSC USA 2
14318 Tin Cup (1996) LBX/SRD 1996-12-17 NTSC USA 2