When it comes to keeping track of things, writing down a quick note or better still, taking a quick picture of it from your phone while on the fly doesn't get any easier than with Evernote.
Since you can install Evernote on any device (and you should), all of the things you jot down are instantly available on the other devices. Quite simply Evernote is the first app you should be installing on any new device.
Go and get Evernote now from my referral link!