An easy solution is to get a free 2GB subscription to Dropbox.com and install your Dropbox account on each of the computers. Then move your latest PAF data and linked photos to your Dropbox folder. If your data is used exclusively from your Dropbox account, any changes on either machine will be automatically made on the other machine the next time it accesses the internet.
NOTE: Links to photos may be broken if you use "absolute" links rather than "relative" links.
If you already use relative links you will notice no difference in how you use PAF, except that you can update your data from either machine.