I installed iLife '04 and was impressed with iPhoto4, which is pretty speedy. However, I couldn't get sharing to work between my PowerBook and iMac. I realized that both iPhoto Libraries were aliases -- the original folders were in my Sites folder, since I was using Michael Mulligan's myPhoto. I replaced the original iPhoto Library folders into the Pictures folder, and sharing worked as expected.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20040125210801600