From Democrats.com some marches and links

We need to end the Iraq War and prevent an Iran War, and impeachment is the way we will do it.

On March 17, the anniversary of the start of the Iraq war (and the 40th anniversary of the famous 1967 March on the Pentagon), Impeach07 will mobilize for a March on the Pentagon to demand peace and impeachment:
http://www.marchonpentagon.org

On March 18-20, Impeach07 will organize local events for peace and impeachment around the country:
http://www.afterdowningstreet.org/...

Impeach07 is also planning:

A "Make Hip Hop, Not War" bus tour promoting peace and impeachment on March 19 - April 21:
http://www.hiphopcaucus.org

A boycott of major corporations that are profiting from the Bush administration's policies, making a killing off of killing, on April 15- 22:
http://www.wearenotbuyingit.org

And a nationwide day of protest: Impeachment Day, April 28, 2007:
http://www.a28.org