I've been under NDA for several weeks beta testing this product and am happy to see Google Presentations finally released.

The quick definition: "Web-Based PowerPoint"

Does it work? Absolutely.

Is it as good as PowerPoint? Set your expectations accordingly. If you need to assemble a deck of slides with bullets and have your presentations available wherever you go using only a web browser, then you'll be happy.

But if you expect to do fancy animations, access a vast library of images, or integrate with other Office apps, then you're setting your expectations too high.

Is it better than PowerPoint? For design work, no. But for collaboration, yes. This is where Google Presentations really shines. You can easily collaborate with others on a single slideshow and even chat with slideshow viewers during presentations.