In an effort to trim bloated inventories, General Motors will offer employee pricing to all buyers on most of its 2008 lineup and some 2009 models. The top U.S. automaker is also expected to make an announcement about leasing certified used vehicles.The employee-pricing offer starts tomorrow and runs through September 2, which coincides with GM's 100th anniversary. It applies to all in-stock MY 2008 vehicles, except medium-duty trucks. Eligible MY 2009 vehicles include the Chevy Cobalt and HHR, Pontiac Vibe and G5 and Cadillac CTS. John McDonald, a GM spokesman, said GMAC won't offer leasing on nine new models during the employee-pricing program. Affected vehicles will include the popular six-cylinder Chevrolet Malibu sedan and the Buick Enclave SUV. The change will be effective tomorrow. He also said GM hadn't decided whether the leasing changes would become permanent.