totally. if you're trying to get the best picture from your iphone -- this is it.
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Camera+ is probably one of my favorite apps for the iPhone. It blows away the stock Camera.app, and has tons of features like cropping, filters, effects, and other options to mess with. It's also *way* faster than the built-in app, and is probably one of the most used apps on my iPhone.
@crobj I broke my iPhone 4 this weekend. Not covered by the insurance and unwilling to repurchase at full-price with iP5 'round the corner, I downgraded & reactivated my iPhone3 JUST so I could continue using Instagram. Sure I could have switched to a beautiful new Droid, but cold sweats and twitching may have ensued without the app.