Just a note before I forget. Terry Brown is using Keynote and loves it. Whitney has discovered the benefits of using the Macintosh "Preview" feature to give a slide show. It can do some cool stuff ( like show thumbnails of all your images on the screen at once that one can select an image from and it zooms up (kind of like the way the faces of albums zoom up from flipping them in itunes). It looks good, its built into Macs and it's pretty generic (assuming you are bringing your own computer etc.).
Need to google this to get more information on this one.
More later. Need to move.