Thanks, I didn't know that. I would much prefer to retain my originals so I will look into others. Is ACDsee standard a good option? I have heard a lot about it. I don't need anything more than basic editing, the main feature I am interested in is organization.
UPDATE: I just installed ACDSee Standard and quickly uninstalled it. Although it appears very powerful it looks far more complicated than I am wanting. When PSE imports photos it does not copy the photos themselves but only creates a database of links to the photos, and automatically identifies duplicates. When ACDSee imports photos it actually copies the photos from the source to a configurable destination but does not seem to identify duplicates, of which I have many. So far I am liking the (simple) PSE interface much better, but would prefer something that keeps the original files intact.
UPDATE2: Apparently PSE does NOT destroy the original file (perhaps earlier versions did so). The editor asks where to save the edited file and appends "edited-1" to the filename and also saves in a different format. Although not as easy to revert as iPhoto it is still simple to do, just delete the edited version from the catalog and the original will replace it. With the exception of the organizer and editor being separate programs it seems the closest to iPhoto that I have found so far.