In regards to your app submission, the title does sound too spammy...and the content is probably a turn off for most HN users, who don't like having to actually log in/download something before finding out what it does. I'd consider writing a blog post that walks step-by-step through some of the technology/code you used to implement your app...Most people probably aren't initially excited by a treasure hunt app, but many of us hackers always like to be inspired by novel ways to use image recognition and/or GPS.