|Evernote, declared by the New York Times to be a "must have app," takes notetaking to a new level. It allows you to take notes, pictures, and voicerecordings while making all of them searchable. You can also sync your notes across all of your devices. Available on iPhone, iPad and Android devices.
|FreeNote incorporates the ability to take notes with your own handwriting. Available on Android devices.
|Noteability is another powerful app that allows you to handwrite notes, annotate PDFs and organize your notes into a library that is easy to search and browse. Available on iPhone and iPad. $
|Penultimate is a handwriting app brought to you by the makers of Evernote. Available on iPad.