You can also hold demonstrations in your congressional representatives offices! Here is my radical left district (more Nader voters than any other precinct in Minnesota), our congressional reps are/were (we lost Wellstone) very nice about it. Gave us cookies and coffee and candy and everything last fall before the "big vote" on Iraq.

Links to the usual suspects (organizers) of the big demos on the weekend of the 18th:

http://www.internationalanswer.org/

http://www.unitedforpeace.org/

http://www.refuseandresist.org/altindex.html

http://www.notinourname.net/

http://www.warresisters.org/

http://www.afsc.org/iraq/activism.shtm [American Friends Service Committee-Quakers, but they work with everybody]

http://www.wilpf.org/ [Women's International League for Peace & Freedom]

DEMOS WILL ALSO TAKE PLACE ACROSS EUROPE ALL YOU EUROCATS!

Here is one of the main orgs doing anti-war work in the UK--click on "Groups" on the left side of the page, there are groups all over the place listed:

http://www.stopwar.org.uk/

And there is WILPF International links:

http://www.wilpf.int.ch/world/worldindex.htm

I will say, I am heartened by what seems to be the movement picking up some real steam here in the US. I nearly fainted when I saw reports on major media channels yesterday (local, NBC Nightly News & CNN) on the anti-war movement.