To practice 15-20 minutes every day; even if I don't need to!
Nearly anyone will tell you that it's better to practice for a short period every day, than to save it all up for a couple of hours every week or so.
With that in mind, I have once more resolved to practice more regularly. Last night was the beginning of it all, and we'll see where it goes. Spent most of an episode of Whose Line Is It Anyway practicing Julia, Across the Universe and Help! I'm on a bit of a Beatles kick.
Julia is actually pretty easy once you get the picking pattern down...I have it in a book, but this transcription seems pretty close. You need a capo.