I went for the first run since my marathon weekend. A nice easy 4.5 miles. Felt great. I think I finished up those races without injury, so that's always a bonus.
I'm thinking about alternating between cycling and running for my lunch time routine. It's easier to get a consistent work out regardless of weather conditions when you're running than it is cycling. But cycling is more fun and much less impact. Combining the two should make for a decent training regiment.