Taking Notes on the Fly: Springpad
You may already have a favorite note-taking app, Evernote, Microsoft OneNote, Catch, etc. But you should consider Springpad. You can create as many notebooks as you want with notes generated from text, audio, photos--even barcodes. As you type, Springpad autofills information culled from the Internet. For instance, make a note about a restaurant you'd like to try, and Springpad will add the restaurant's address, phone number, cuisine, etc. Springpad is social, too. You can invite others via email to contribute to your notebooks, and you can comment on each other's entries. My one gripe: I couldn't find a way to change a notebook's name after creating it.