I found this brilliant explanation of 'Bullet Journals', a great way to utilise a plain notebook.
The layout is very simplistic once you get your head around it and the indexing is neat for future browsing. I like that there is no pressure to write anything as it isn't printed, you write the dates etc. in yourself. I get the feeling this is a little too liberating for me and would take away my commitment to write daily but it seems ideal for planning. I hope some one might find this interesting regardless.
I'm away to read a bit of Michael Palin's memoirs about his journals during his Monty Python years, bring on some inspiration!