The flexibility and ease of use offered by not-installed software is what makes projects like http://portableapps.com/ http://portableapps.com/ so popular. The

The flexibility and ease of use offered by not-installed software is what makes projects like http://portableapps.com/ http://portableapps.com/ so popular. The possibility that installing an application may splat arbitrary files across my system has always been unnerving to me.