Members of the international arts community are petitioning the Ministry of Culture of the People's Republic of China to release artist, Ai Weiwei. You can sign the petition, started by the Guggenheim Foundation, here.
Link to: Petition for the Release of Ai Weiwei
Change.org, host of the petition, has been under cyber attack from China in an effort to shut down the site and stop the petition. Change.org engineers are working around the clock to keep the site up.