If you've ever wanted to know what type of motherboard you have or other hardware info without having to open up your machine,
siw scans your machine and provides a comprehensive list of all hardware and software components. It's very useful if you've formatted your computer and need to find a driver for some hardware component but the list of hardware devices through windows my computer properties doesn't bring it up.
I'm also a big fan of google's online calendar and spreadsheet software for collaborating with remote groups of people.