For anyone that's still using the iPhone's default Camera app, Please go buy Camera+!! I'll Paypal you the dollar if you need it. Aside from being better in almost every way, you get the bonus of filtering pictures before they go to you PhotoStream. My PhotoStream hasn't had a single out of focus, poorly cropped, or accidental photo since I bought C+.

My theory is that increase in sales of camera effect applications is directly correlated with increased popularity of instagram.

Atleast in my household our iTunes bill has included much more camera apps after my wife signed up for instagram.

Any other takers for this theory?

What happened with the whole "volume button as a shutter button" rejection issue? Especially now that Apple does it in the stock Camera app. Is it allowed on the App Store?

You're on news.ycombinator.com, a site emphasizing on startups, app development, and dare I say, generating revenue. I'd say the answer is 'pretty much everyone here'.