The idea for PiBakery came about when I went to a Raspberry Pi event, needed to connect my Pi to the WiFi network there, but didn't have a monitor, keyboard and mouse. I needed a way of adding a WiFi network to my Raspberry Pi that didn't require booting it up and manually connecting.
PiBakery solves this issue. If you've already made an SD card using PiBakery, you can insert that SD card back into your computer, and keep editing the blocks to add additional software, configure new WiFi networks, and alter different settings. All without having to find a monitor, keyboard and mouse.
For more information about editing existing SD cards, please see the Editing an SD Card Guide.