Google Presentation is not quite robust a presentation program as PowerPoint or Keynote but students can create their entire presentation online and work on it with group members or access it from home/school. But I have found the REAL POWER of Google Presentations is when you use the online presentation format.
Instead of my students sitting passively watching a student's PowerPoint presentation, a presenter publishes their presentation online. In the Computer Lab each student logs into a Google account and accesses the presentation URL. I allow students to participate in the chat during the presentation as long as their comments are about the presentation, they type additional information about the content, or ask questions to the presenter. I monitor the chat closely - but I have to say - when I have done this with my students - there is 100% engagement in the presentation and they handle the responsibility of being in the chat room well (it only takes one student to get kicked out and the rest shape up fast!). They love it and its a great way to get the whole class involved in a presentation.
Here's how it works:
Intro to Google Docs >