I travel a lot, and would like to be able to edit, tags and organize photos from two separate machines. Sometimes my wife may be doing it from the home computer while I am doing it from a laptop while in a hotel. We would both be online simultaniously, so I am not worried about editing offline. We do minimal cropping and red eye reduction but I am more concerned about managing the thousands of photos than spending time on single photos.
I have used
Adobe Elements in the past, and was annoyed as it seemed that our time spent tagging was tied to the proprietary software. Seems odd that it is so hard to export these photos to offline photo book makers - but I guess that is a second question! Right now I use Picasa - if there was a way to automatically synchronize then it would be perfect.