Though currently in beta (and technically an Adobe Labs product, so don't use it for mission-critical stuff), Acrobat Presentations already shows a lot of polish. If you've ever created a presentation, you'll have no trouble using these simple, straightforward tools. In a matter of minutes I was able to whip together one seriously stylish-looking slideshow, complete with transitions, uploaded images, and even FLV video files.
Presentations also supports a high level of collaboration: You and multiple co-workers can work on a slideshow simultaneously. This could be a major timesaver: Instead of sending a document around and around for changes upon changes, just get everyone on a conference call and hammer the sucker out together.
Alas, Presentations can't import PowerPoint documents, nor can it export them -- it's limited to PDF. It also lacks support for audio and requires each collaborator to have an Adobe ID. I don't expect the latter hassle to disappear, but I expect Presentations will flesh out its feature set as it develops.
I must say, Adobe's been doing some interesting stuff lately. There's Photoshop Express for online image editing/storing/sharing, the Buzzword word processor (arguably the most attractive of its ilk), the Acrobat.com Outlook plug-in for sending large files, and now this.
While you're at it, see everything BNET has done on the subject of presentations. There's enough good reading there for a month. [via Digital Inspiration]