Hi Peter,
I think there are a couple of options out there for you.
1: VLC Media Player is a very simple and very powerful multipurpose media playback application that is built to handle virtually every codec imaginable (I say virtually because, to my knowledge, VLC can not handle the ProRes codec) Because it won't playback ProRes files you would have to transcode them into something like h.264 to use VLC. The playlist functionality is very easy to interface with, and the open source developers of the program have released a companion app that allows you to turn your iPhone or Android phone into a wireless remote for the computer you're using. Perhaps best of all, both the player and the app are free!
2: Import all of your videos into iTunes and use the playlist functionality there to build your presentation. iTunes will still let you display your videos full screen.
3. (and I think this one is least ideal, but is an option) If your movies are all the same resolution, you can copy and paste them into a single QuickTime file, assuming you have QuickTime Pro, and then save that movie as a Reference Movie from the Save As... dialog. Then your movies would play together as a single video, without the need to edit it. Again, not very ideal, but it is one way you could use QuickTime, and only QuickTime, if that was your main concern.
Hope that helps!
Good Luck!
joel
Corporate and Special Event Staging Services
http://www.pacificstaging.com