A couple of tools that I have been playing with that are continuing to lure me away from traditional desktop applications are:http://280slides.com/Editor/
Both interesting and not necessarily aimed at the Powerpoint/Keynote power user but they are more than worthy of making a quick and elegant presentation all within the web browser. Give them a whirl and let me know what you think.
How do you see these integrating into the classroom? Would faculty adopt them? what are they missing? At the Opencast meeting today we spoke about creating/integrating tools into Opencast/LMS systems that "don't get in the way" and allow faculty/students to easily create new, shareable content. Both of these tools seem to fit the bill, with elegant interfaces, easy learning curve, and none of the bloat of their desktop equivalent. Create it, share it.