I was at a church that used Sunday Plus and I just wasn't too impressed by it. It could handle PowerPoint, some videos, and displaying pictures/videos behind the words on screen. However, formatting text for the singing portion of worship was kind of awkward and really not intuitive. The PowerPoint viewer worked okay, but the instant that it lost focus, you were wondering why it had "stopped working". If your paths were not exactly the same on any computers you were working with, you'd also run into problems as it didn't seem to work with relative paths all too well. I was also not impressed by the long startup time. I know that other programs are available and was wondering what people were using as well.
I'll try to find out what our current church is using for presentations. It seems to be pretty capable as far as being able to make adjustments to on-screen text quickly. I know that Powerpoint and videos are possible through the software as well. I'll post back when I find out the name.
-Pete Schott