Zoho has just released an online slideshow application, which is one of the very few web-based presentation products available. Called Zoho Show, it combines the functionalities of a desktop presentation tool - like Powerpoint - with a web app.

Zoho Show is an online tool to create, edit, publish, and show presentations. It's web-based. So, users don't need to download or install anything. All they need is a browser (Firefox 1.0 + or IE 6.0+ or Mozilla) and internet connection.
Zoho Show aims to make it easy to create presentations and slide shows, via the web browser. Zoho Show is ideal for sales persons, business owners, teachers, students, freelancers ... and for just anybody else who wants to create presentations online.

Key Benefits
1. Access from anywhere
Access, import, and edit presentations from anywhere. 100% FREE unlimited storage.
2. Load  existing presentations
Import Microsoft PowerPoint(.ppt) or OpenOffice Presentation(.sxi).
3. Simple, easy to build and edit
Build and edit presentations on-the-fly using WYSIWYG editor.
4. Remote presentations
No need to use web conferencing tools to give presentations. With Zoho Show, users can present slide on-screen with remote control.
5. Flickr integration
Pull publicly shared images from your Flickr account into a presentation.