http://www.google.com/crisisresponse/japanquake2011.html – This link is for monetary donations. It is a google page made by the Red Cross in Japan. The lowest people can donate is 100 yen which is roughly $2 and change.Every little bit counts.
www.2hj.org – Second Harvest is an organization in Japan where people can ship supplies that will be on the ground DIRECTLY to the people who need them. Take a look at the list of supplies at the link. You might consider gathering up a big box of supplies and having a few friends pitch in for shipping to Japan. They need raw supplies more than money at this time.
