Strengthen American Manufacturers Act of 2008

Strengthen American Manufacturers Act of 2008 - Amends the Internal Revenue Code to: (1) make permanent the tax credit for increasing research activities; (2) increase to 20% the rate of the alternative simplified tax credit for research expenses; (3) make permanent the increased expensing allowance for depreciable business property; and (4) reduce to 30% the maximum income tax rate for corporations.

Directs the Comptroller General to conduct studies of: (1) the impact of workplace employee health care facilities on employee health and and productivity; and (2) the best practices for encouraging college graduates from rural areas to return to those areas after graduation.