If you think you want to journal more in 2015 I couldn't recommend a better app than DayOne. It's on sale for $0.99 For iOS and well worth it.
I keep track of personal entries only but with tagging one could easily include work or other kinds of thoughts. Add photos, geolocation, current weather all automatically while jotting down what's in your head whenever you want with this journal you can carry wherever you go. Day One (Journal / Notes / Diary) by Bloom Built, LLC