I remember reading, in Dudley Andrew's Breathless, Godard talking about how À bout de souffle could very well be the sequel to Bonjour Tristesse (Preminger, 1958), specifically Jean Seberg's character. I think that Charlotte et son Jules could easily be the sequel to Breathless, if Michel hadn't been murdered. Think about it: Michel escapes, Patricia meets up with him, and they live happily ever after. Except they don't, Patricia runs off with a director, etc.
Michel Poiccard and Jean are very similar characters, if not the same one. Their attitude towards women, their rogue romanticism... Needless to say, Patricia and Charlotte are somewhat similar as well. Another fine example of auteur theory by Godard.
Update: I just read that Breathless was born out of this short, apparently. I feel like I've spent 10 minutes stating the obvious. Awesome.
Here is the first part of the short, if you haven't seen it already:
