Yes, if your spouse is resident, then you can choose to file resident tax return for 2008. You must pay FICA taxes from 2009.
If you are a degree candidate and if the financial aid (includes scholarship and fellowship) is for tuition fee, other fees, books, supplies and equipment, then it is not taxable. For a degree candidate aid for boarding and travel are taxable.
If you are not a degree candidate, then all the financial aid is taxable. Read scholarship and fellowship grants,
Your U.S. Tax Return: The U.S. Income Tax Topics 1