It seems like a lot of really fun single player games, especially two stick shooters, on Xbox Live Indie Games don't have online high score leaderboards. I'm not a game developer myself but it seems like this stems from there not being a uniform way of adding them to a game, and because developer have to host their own systems to maintain any leaderboards they might want to support. So, in a lot of cases they get left out.
I realize it is not the same as automatic leaderboards, but would anyone be interested in having web based leaderboards for Indie Games? I've been looking at it a little and it seems like it would be fairly simple to setup a section on XBLIG Ratings where people can submit their high scores with a photo or video. I'm thinking similar to how Score Hero does high scores for each Guitar Hero and Rock Band song. You just pick the game, mode, difficulty, etc. and then specify your score with the proof.
Let me know if that sounds like something you would be interested and I'll see about getting it setup. However, if you don't think you would use it let me know that too so I can focus my attention on other aspects of the site.
Xbox Live Arcade & Indie Game Ratings