The Good and the Bad
OperaShow is a great way to create slides. Because the slides are authored in HTML, they can be used on any operating system that supports the Opera web browser. You can easily change the look and feel of the slides by using CSS. On top of that, you can further spice up your OperaShow slides using graphics or JavaScript effects.
On the other hand, you need Opera in order to use OperaShowit won't work in any other browser. Unless you're comfortable working with the HTML, CSS, and other web authoring languages, you might find coding OperaShow presentations to be a bit daunting. Finally, an OperaShow presentation can't duplicate many of the fancy effects that some people have come to expect from PowerPoint.