Here is a small Aperture tip I forgot to mention.
I work on Aperture on two machines, my Powerbook G4 and my girlfriendâ€™s PowerMac G5 when I can sneak in some time. One problem I ran into was finding that the keywords (and also various export settings) I have set up in Aperture are not carried with the Aperture Library.
The trick is realizing that they are stored in your home directory in: â€œ~/Library/Application Support/Apertureâ€
To carry them with you to the other machine, simply copy this folder from the machine you set Aperture up on to the one you havenâ€™t. Then the export presets, keywords, and keyword sets will become available to that machine.