Why Picasa is the Non-Professional photographers best friend

Many of my friends like to take pictures and video, but more and more of my friends, dont use any kind of photo or video management system for their photos, instead opting for using windows to manage their files. This is well and dandy, but it can lead to confusion, and its easy to lose track of your photos if your collection is large enough. When importing photos or videos from the camera, where are your photos placed? How can you access them later? And how can you easily edit them?