It is clear that Google is enlarging its office-like offerings. While they already offer Word & Excel counterparts, a PowerPoint counterpart is on its way, though has been largely rumor-ware up until now.
If you click on sideshow a flash-based player is opened and away you go.
The player gives you a number of options, including one to "embed this presentation," assumedly in a website or blog.
This hasn't been enabled in my account, but it looks like very, very handy product. Imagine going anywhere on missionary tour and never actually needing PowerPoint to show your decks. It's all in the "cloud".