A fall in the share price of battered BlackBerry maker RIM puts the firm's market value below the value of all its stuff today.With a share price of $18.59 at 12.21 EDT, Research in Motion's total stock added up to less than what its property, patents and other assets are worth, according to the book value of $18.92 a share calculated by Bloomberg at the end of last quarter.RIM has taken a number