I know the GT Fitness open thread was last night, but if you're looking for motivation to run/walk, the Zombies, Run! people are having a sale.
My iPod can't run their apps, so I can't personally vouch for their effectiveness, but everyone I know who has used them loves them, and they're at the top of my list if I do ever get a smart phone. One of the things that I really hate about running is how mental it is, and running from imaginary zombies sounds like the perfect way to circumvent that. Apparently they also have a walking one too, if running isn't your thing.