Flowgram Makes Web Presentations Easy

Flowgram lets you string together many types of multimedia files to create a web-based presentation others can view with no downloading required.
File types supported: PowerPoint presentations, web pages, RSS feeds, photos, text and audio files.
Audio narration feature lets you record yourself to walk viewers through the presentation.
Currently video is not supported, nor are presentation formats other than PowerPoint (such as Apple’s Keynote).
Service works well, but could use a speed boost.
Competes in the same space as Animoto.

Made tiny from: Mashable.com original post