Three online presentation applications, these go beyond the basic functionality offered by Google Docs or Zoho Show making them attractive beyond just being a replacement for your desktop application.

SlideRocket

SlideRocket have built a very slick presentation application which incorporates the advantages of being web-based (flickr photo search etc.) with the ability to take a cached copy of a presentation to play in an offline player, meaning that you are not reliant on a web connection in order to present. The collaborative aspects work well allowing presentations to be shared publically or by password. You can also share presentations, images or individual slides with other SlideRocket users creating a large pool of content to choose from.

280 Slides

280 Slides has steered clear of adding too much advanced functionality and focused on ease-of-use. For many people this will be the fastest of these applications to dive in and start using.

Empressr

Empressr is an application which differentiates itself through social network integration tools, in addition to a wealth of sharing options for embedding presentations in Facebook, Myspace and others, they also have the facility to import live tweets from twitter into a presentation. Brave presenters could import live feedback as part of their presentation.