I do run a couple times a week, so a related challenge is a good idea. Maybe a half-marathon, though. Where would I find a good training regimen for such a thing (Web sites, mags, etc.)?
As far as training schedules go, Hal Higdon.com is a good place to begin. Lots of good schedules for various skill levels. I know he has marathon training schedules there. I'm assuming he has half-marathon ones, too.