I’ve finally had a chance to start playing with The New Yorker DVD. To my surprise and delight, the issues are stored on the DVDs as DjVu files, the same format that NOAA is using for their archival weather maps.
Update: I received the following from The New Yorker technical support in response to a query about whether it’s possible to view the DjVu files in other applications:
Unfortunately, this is not possible. The discs are copy-protected to prevent successful copying or viewing files in another application.