This is not fully tested yet, (just thought of it this morning) so i’ll update a bit later and report on as to wether things goes completely mental, but the way I’ve done this is as follows…

Make sure Things is completely shut down, then open up a terminal and type in the following commands:

cd ~/Library/Application\ Support/Cultured\ Code/

This moves us into the correct directory. First, to be on the safe side - we’ll take a backup of our files…

cp -R Things Things.bak

Now just move the Things directory into your dropbox and create a symbolic link in its place.

mv Things ~/Dropbox/
ln -s ~/Dropbox/Things Things

Fingers crossed this should have the desired results!

Update: It works!!! On the second computer all you need to do to get the ball rolling is to close down Things, open up a terminal and type the following commands:

cd ~/Library/Application\ Support/Cultured\ Code/
rm -rf Things
ln -s ~/Dropbox/Things Things

Note - my 2nd mac only had a fresh install of Things - no data. I installed it, opened it up (so the initial database was created), then did the above.