I like Prezi. It looks fantastic and is a great up-to-date alternative to PowerPoint. We have a lot of PowerPoints on our shared workspace that we use to help deliver inductions. They are looking tired and, because we have a policy not to use animation within them, they aren't very engaging. Even if we couldn't harness Prezi's full ability I think it could help refresh our content and help keep students interested. (However, the cynic in me does wonder how long it will be before we get the Prezi overkill!) I have found Slideshare quite useful in being able to access PowerPoint slides that were used during an event - being able to deposit them all in one place is a much easier solution than emailing them round to everyone.