If you have a Palm OS Handheld (PalmOne, Sony Clie, etc.), you might want to check out a genealogy program for Palm OS called My Roots that has Mac support. It is a genealogy application that can import/export GEDCOM files to and from your Mac and your Palm OS Handheld through a conversion utility. You can view or change any data in My Roots on your PDA, and the changes can be exported back to your Mac.