Rene Ritchie's pick of the week on MacBreak Weekly 405 is version 2 of Vesper for iPhone. This is a simple note-taking app that can utilize tags to organize information. This gives you the flexibility to organize your notes however you want, such as by theme or category. You can re-order notes simply by dragging and dropping them, and quickly archive notes with a simple swipe. It also lets you attach photos to notes.
Version 2 of Vesper introduced syncing between devices. The developers also recently announced that they're working on a Mac version as well.
To hear Rene's recommendation of Vesper, check out MacBreak Weekly episode 405.