Lists of new ideas.
Lists of projects.
Lists of goals to accomplish this year, or even the next five years.
Lists of what to accomplish tomorrow or next week.
Then, once you've got your list, as they're accomplished, cross them off. It's simple. I've read a lot of motivational books, from Zig Ziglar to Earl Nightingale and Dave Ramsey to Dan Miller. Thread throughout their messages there seems to be an underlying truth: write stuff down. You will forget them, so when you get an idea (even if you think it's stupid), write it down.
By the way, the title for this blog comes from a song in the Robin Williams movie Mrs. Doubtfire. Here's a video of that song.