Nemo is a different kind of file browser. You can use it to browse files based on the date you last accessed them, in a calendar-like interface. So by using Nemo, you don't have to remember where you put it, but when!
When you start the application up the first time, it scans your home directory for files and displays them in the calendar view. It will then watch the files for changes (you can force a reindex with --reindex).
Nemo may seem like a weird file browser at first, but you will then realize it's very useful for when you forget the name of some files, and only remember that you've used them sometime recently.
Try Nemo: Ubuntu / Source files