Having a voice recorder app on your phone enables you to compose memos, brainstorm, or record the crazy guy on the subway. Of the many voice recorders available, but I think that Livo Recorder Pro is the best. If you need high quality recordings, you can set the app to record in .wav format. It takes up more space, but you can hear the difference. You can e-mail recordings to yourself and then upload them to Dropbox or even to Evernote. Evernote has voice-recording capabilities, too, but it’s more error-prone than Livo, and it seems to wrestle with offline storage issues, too.