For motivation, Justin and I have signed up for the Albuquerque Zoo Run, which we have done for the past couple years, in addition to a few other local 5K runs. I'm back to my 5K running program, which worked well the first time around.
Intervals are key. If I try to run the whole thing without building up over time, I will finish, BUT I will burn out and decide that running sucks (again) and I'll be back to square one (again). This is not the goal here.
I am also reading The Perfect Mile: Three Athletes, One Goal, and Less Than Four Minutes to Achieve It. While I know all-to-well that I will never be a 4-minute-miler.... or a 6-minute-miler.... or anything that might be considered fast, I love the story. The determination and the motivation fascinates me. Even if you loathe running, you might like this book. Really. While I hope it motivates me to hit the trails and the road, perhaps it will motivate you to do something else you've been hoping to begin.