I have been presenting with Keynote slide shows. I think they make an attractive way to showcase the text and the discussion points I want to get across. I am considering adding an audiotrack to these and making them available as Quicktime videos. I have them at the link below as PDF files with no audio (of course).
Anyway, if you’d like to read some studies in Revelation that attempt to balance theology, exegesis, background, and practical issues, check them out: