The issue is more one of compatibility than RAM
I worry about the odd application being incompatible with the many other things running on my machine at the same time. So far, I only very rarely get Blue Screen crashes, but I know how sensitive a Windows system can be. One corrupted file away from a rebuild...
My system tray has had, at various times, screen savers, a widget that activates the screen saver immediately, something that takes pictures of the screen, a world clock, an Intel processor monitor, Norton's system monitor, ZoneAlarm, and a few others.