Lady Gaga designed a bracelet with all proceeds going to relief efforts and Mike Shinoda from Linkin Park did the same with t-shirts. Charlie Sheen seemed to have a moment of lucidity and donated $1 from each ticket sold to his recent show to help in Japan.
Sandra Bullock did indeed give $1 million to relief effort just as she did with Katrina and Haiti. Heroes star Masi Oka is putting together a telethon and many other stars have donated their own funds and also encouraged fans to do the same.
Also, Warner Brothers, Disney, and other studios have made large donations.