AV578:
You have the option of filing jointly with your spouse and you BOTH choose to be treated as resident aliens for ALL of 2008.
It will required that you wait until early June 2009 to file (in order to meet SPT), but it will allow you to claim either the tuition deduction or one of the education credits (most likely, the Lifetime Learning Credit).
There ARE caps on the amount of the deduction and the amount of the credit.
You CANNOT claim the education deduction/credit on either the dual-status or non-resident alien tax return.
Filing jointly with your spouse will have NO EFFECT on your spouse's exempt status when it comes to Social Security and Medicare taxes. See link below:
Nonresident Spouse Treated as a Resident