You have both the choices:
1. File nonresident tax return or

2. File joint return as residents after you complete SPT in 2009. You will get standard deduction of $10,900 and exemptions for both of you.

You must both declare your worldwide income for 2008. If you have any foreign income, and on that income you paid taxes in the foreign country, then you can claim foreign tax credit.

You will complete forms W7 (application for ITIN) for your spouse and attach with your tax return. You can also deduct moving expenses. Use form 3903.
Read about L1B tax filing: Your U.S. Tax Return: The U.S. Visas