I've been taking a crap load of pictures since I got my iPhone. If you haven't noticed I post a lot of them on my Tumble page. I'm three or four camera apps in trying to find the one I want and this one looks the most promising. You can apply multiple filters very easily and share them to multiple sources (facebook, twitter etc..) even easier.
If you haven't heard of Chase Jarvis then I recommend his blog. He's very encouraging of using technology to assist the creative process and is definitely not an elitist photographer by any stretch.