I just got news in my inbox that CircusPonies Notebook (my favorite information organizer) now comes with Drobox integration, letting you sync your Notebooks to your iPad. I use Notebook as a master case document in my disability practice and it helps me keeps all the parts of my cases organized. Here are some early comments about Dopbox syncing in the CircusPonies forums.
CircusPonies Notebook for iPad is available in the iOS App Store for $29 (ouch!) . The original desktop version is also available for $59 at the Mac App Store. However, if you only plan on using Notebook on only one device, you can buy it for $49 at CircusPonies site.