Shareware & Freeware ...
You can get everything from games to utilities to calendars! My favorite download sites are : Tucows, CNet, ZDNet, Winsite , to name a few. Of course your tech support people will warn you against these little programs since sometimes they conflict with hardware/software configurations already running. So try to limit them to ones you'll really use.
My most recent find is a little memory optimizer that lets you clear your RAM and keeps a monitor active so you can tell when you're running out .. that's when Windows locks up! It's called MPower and I found it at the MindBeat Site. It is something I wished someone would invent, and here it is!