I have several goals in my Someday/Maybe list(s), which I diligently check every Weekly Review.

Sometimes it produces guilt (I STILL haven't set up a workout plan, nor have I followed through with one in ages) but then there are other goals that are more or less continual, which I've put on a list called "Focus Areas." This is not quite mission-statement territory, but somewhat similar, and reviewing it every week helps me to keep those things in my mind which I might otherwise forget about or simply give up on due to frustration. (One of those things is getting more twentysomethings involved at church.)

You might also tickle some goals so you can check your progress on them, or put them in a sort of "Incubate" context along with other ideas that are on the back burner. Sometimes it's best to work on an idea, then put it away, and when you come back, you brain has solved it subconsciously. Hence the "shower idea," where you discover something while you're doing something else, like shaving or taking a shower.