12 Top Notch Online Presentation Tools from SitePoint Online Presentation Tools for the Classroom from LiveBinders Presentation Tools from PBWorks Prezi    Prezi lets you bring your ideas into one space and see how they relate, helping you and your audience connect. Zoom out to see the big picture and zoom in to see details — a bit like web-based maps that have changed how we navigate through map books. What are Presentation Tools from Mikogo

Presentations: From EdTech Toolbox

Bubbleshare - your photos, your voice, your story - narrated slide show online

Glogster - create online posters, media rich online posters that can be shared online or embeded onto wikis.

Myplick is a free service that lets you share and embed presentations online.  Formats supported are powerpoint, pdf,  and openoffice odp. 

Prezi is a web application that allows you to create stunning visual presentations. Think PowerPoint meets mind map.

Slideshare allows you to upload and share your PowerPoint presentations. Presentations can then be embedded into blogs or wikis.

Slideroll - create presentations from stills