As a relatively new iPhone owner (nearing my 1 month...), I am starting to catch on and explore the wonderful world of apps. One of my absolute favorites: instagram. I like to flex my own amateur photography muscle and admmire the work of others.
I think the coolest part is that you are getting a true peek into someone else's (normally someone way cooler than you) life. No schedule posting or heavy-duty Photoshop.. just you, your environment, and a filter, to add some artsy-ness. My favorites:Kate Spade, Paul Ferney, and Bergdorf Goodman.