In the old gnome screensaver configuration box (which just ran xscreensaver) there was a way to select which screensavers you'd like used for random selection. This is a really nice feature as some of the screensavers from days gone by are so poor and boring in comparison to the really slick screensavers around these days. I miss this feature and some others from the old configuration dialog, but the interface is much snazier.