I had been one of those luck guys, to get an invitation to join the Office 2010 Technical Preview (thanks to Microsoft). As I was studying for my exams, going through the PowerPoint slides, I discovered a new feature. It is called Reading View. As you can see in the screenshot below, it allows the PowerPoint slide to take the full view and yet bet able to see the taskbar. This useful feature enables me to chat with friends, or do some other things simultaneously (especially when studying for exams, I communicate with friends about the particular note in the slide. :-)
I think this can be useful to you guys out there. To activate it, you can click the Reading View button on the bottom right of PowerPoint.