My natural tendency would be towards patience, I think, so I would be in danger of letting things slide. Realizing that, though, I'd be in a position to do something about it. If the goal is to keep your name on the radar, it seems like you just need to get something into the contact's inbox. What about a note detailing new features or improvements you'd implemented in the past week or two? It could be a way to indicate continued interest without feeling like you're badgering. Hopefully the contact would reply and provide some insight into the progress. If not, a more direct approach would probably be warranted.