Sent to you by David Andrew via Google Reader:
With rvl.io This is a very simple presentation tool, with the main emphasis being that you can show slides to the right/left and up/down. It would be a useful tool if you were having a fairly free and easy approach to a presentation and were happy to go with the flow of what interested the audience. It was very easy to use, and I created a very simple presentation in a matter of moments. However, until it gets considerable more functionality, it's going to have limited appeal.
If you'd like to get a feel for it, my presentation (of some of my photographs) is here.