Do you often receive lots of PPS files and use openoffice to open them? The only difference between PPT and PPS is not the file format, but how Microsoft Powerpoint handles them. The former is opened in edit mode and the latter in slideshow mode. OO, however, does not open PPS in slideshow as it should, what is not such a big deal as it is only one click away, but why not make it easier if we can?
There is a recent extension (or package, depending on the term your distro uses) for OpenOffice named ImpressRunner. Install it and, whenever you open a PPS, it will be directly displayed in slideshow.
And its announce email: