I wasn't aware /r/gamedev invented Screenshot Saturday, but I do know it's very popular among all game developers[0]. I like the idea of a similar weekly tradition for HN. Weekly feedback is great motivation, and the ideas that come out of here are often superb. That being said, screenshots are not the best format for every progress report. It works well for game developers because such a large part of games is visual, but that's not the case for a lot of things hackers might be working on. Something like "Side Project Saturday[1]" would work much better.
Another problem is agreeing on who would post these weekly threads. If something semi-official wasn't decided on people may race to be the first to post every Saturday because of the guaranteed karma, which would lead to threads starting at pessimal times. While the optimal time would be 9 AM EST[2] for maximum exposure, people might be posting the second it turns midnight (or even earlier), which would lead to empty threads and ultimately the death of the tradition. Perhaps a novelty account could be created just for the sake of posting these threads with no affiliation to anyone in it's bio, in the same way there's the user "whoshiring"[3].
To follow the rules of this thread: This week I've been working on my Snapchat Marketing SaaS app. I recently lost a lot of my backend work, so rather than immediately rewrite the code I lost I'm focusing on the frontend part to keep my morale high. Here's a screenshot: http://i.imgur.com/d3La9td.png
Edit: Oh yeah, I also forked "HN Special" and added the ability to save posts for later: https://github.com/gabrielecirulli/hn-special/pull/58#issuec...
[0] https://twitter.com/search?q=screenshotsaturday
[1] It even follows the "S" formation!
[2] http://nathanael.hevenet.com/the-best-time-to-post-on-hacker...
[3] https://news.ycombinator.com/user?id=whoishiring