I am a professional photographer who often needs to show particular photos to clients. I am hoping to use my new iPad 2 for that purpose. As I do all my post-processing work on my iMac in Photoshop Lightroom 3 I have no need for an app to process images on the iPad itself. I do, however, need an app that will allow me to identify images a client wants to purchase by jotting down the image filename I applied in Lightroom. What would be the best choice in apps for this purpose? Thanks!