Aaron Eckhart can't stop signing on for movies.  Earlier this month he signed on to star in Stuart Beattie's I, Frankenstein, and he's also attached to the crime-thriller Pan and Neil LaBute's The Geography of Hope.  According to Variety, he's added another film to his slate by signing up to play The Beach Boys' drummer Dennis Wilson in Randy Miller's indie music biopic The Drummer.  Miller comments that while everyone knows about Dennis' brother Brian, The Drummer will focus on "the last six years of Wilson's life, before his death in 1983."  Eckhart will executive produce and record his own renditions from Wilson's 1977 solo album Pacific Ocean Blue.  Shooting is set to begin next year in late spring to early summer.The ubiquitous Eckhart will be seen in theaters next Friday in The Rum Diary, and he's also starring in the action flick The Expatriate, which currently doesn't have a release date.