How do I burn a single ( > 7GB) file to multiple DVDs? I have single file that is 7GB that I want to burn to multiple DVDs. Is there a way to do this that's built into Mac OS X? 

When I try through the finder, it informs me there is too much data and tells me to remove files and try again--so I realize it doesn't work that way. I've seen information about doing it through a shell script, but those seem too "Unix"-y, and this is something I'd like to be able to hand to a friend to copy.

Failing anything built-in, can you recommend software (paid or free) to accomplish this task?
The built-in way is to use the split command in the Terminal, which, yes, is Unix-y. Alternatively, .rar files can split a single file into multiple files. You might check out SimplyRAR for this route.