EWTN is already covering the March to Life, soon to get underway. If you don't have EWTN on your cable station, you can watch coverage live on the web. And, iPhone users can watch or listen here.
I was looking for someone twittering from the March for Life, but have not found anyone yet. There is a label for March for Life, so you can follow that for interesting comments and links.
Links:
The obedient are not held captive by Holy Mother Church; it is the disobedient who are held captive by the world!