I was looking through del.icio.us today, and I came across a website called ThumbStacks.

ThumbStacks is an presentation/slideshow-making online service which appears to use a mix of Java and Ajax. The site, at the moment, is in public alpha. This should mean the site is unstable, but I actually find it to be less crash-prone to the only other such site I’ve used; ThinkFree Office Online.