Last weekend I attended the first 1197 iphonographers conference in San Francisco. I was only able to attend half the day but just that was a tremendous boost to my creativity. And I was able to listen to the videos of the afternoon talks on vimeo later.
The app stacking demonstrations were very helpful in showing me new ways to use old apps and new apps to use. The image in this post is an example.
The speakers used the apps that they recommended you come equipped with. My favorite find was Phonto, a font app with lots of fonts.