GanGanOn-line has been holding "Cheer Up, Japan!" drive, in which Square Enix manga artists are donating their drawings with messages, and these drawings are used in various charity functions to generate funds to help Japan.
And, this is Arakawa-sensei's drawing with her message:

My quick translation of Arakawa-sensei's message:
The area that was damaged [by the Eastern-Japan Earthquake] has always been providing us with electricity, and variety of agricultural produce and seafood, etc.
Now is the time to practice "if given 10 favors, one should repay the kindness by returning 11 favors."*
March 2011, Hiromu Arakawa
(Direct translation of this part is "Now it's 'if given 10 give back 11' time." ^^)
You can see this drawing and other artists' donated drawings & messages on GanGanOn-line's Cheer Up Japan! site.