So here are a few of my favorite Apps for the iPhone. I have found that the iPhone takes relatively decent pictures considering it is a cell phone. It eliminates the need to carry an extra point and shoot camera for basic day to day shots.
A few people have asked about the pictures I post on Facebook including these two. Like what camera I use and what App I use to process them. The first App I use is called Instagram, it is great. It has a few basic filters and effects, nothing too fancy. It creates a feed similar to Twitter of your photos, and the photos of the friends you are following. It is very similar to Twitter, but with pictures. I highly recommend it if you have an iPhone. You can share the pictures on Twitter, Facebook, email, or on the web. It also saves a copy on your phone so you can do whatever you would like with it, like post them on your blog. I like the subtle effects, and how easy it is to use.
Another good App that is actually tied to the first is called Postagram. It allows you to take pictures made with Instagram, or any picture from your iPhone and turn it into a postcard. For only $99 they will print your postcard with your picture and message and send it to whoever you like. I have only used it a few times but I have a few other ideas in mind for it.
I have a few other photo apps for my iPhone but these by far are my favorites. They are simple and creative. If you have an iPhone I recommend you check them out.