Note writing apps that works with Dropbox. I have both Notesy and WriteRoom. They help me keep track of ideas or draft posts.<p>iPhoto. I never get around to touching up my photos once I'm on my laptop. Now I can do it on my phone.<p>I don't think price matters for my choices (so far). I was one of the first to buy OmniFocus ($20 or was it more?), haven't been using it for years.