UNIX for Advanced & Expert Users

I have to synchronize files on two machines, but these are not connected via LAN. Now I'm using DVD's to copy new data.
The question is how can I create a list of files on one machine and having this list archive or copy only new files from other. Are there any standard tools like diff/patch for sources?

As an aside How about unison?

tar the files onto the DVD and then later off onto a disk working directory to preserve file metadata. Use stat to write filenames and mtimes to a file that lives in a safe place. Run unison or whatever to get the files in sync. Then burn a new DVD only with files from the working directory that have different mtimes than the before snapshot, based on the file with mtimes.

If the two systems support ssh, you can run unison under ssh through dialup. unison is very efficient and only moves the deltas of file data, not usually whole files. It may not be what you'd want but it's worth a look. Better than the sneaker network.
(meaning carrying disks back and forth between computers)

I think unison is too "heavy" for my purposes. I need not to work with CVS or SVN, also all files may be considered as binary (i.e. no patches based on their content, files must be just replaced with newer).
I thought that I can make a list of files on one computer (with find/ls/stat or so) and feed this list to the tar on other computer to make an archve with new files. Is this possible?

By the way I cannot connect these comuters by network due to security policy of the company