2008 tax filing - I am a US citizen that has no US earnings and moved to the UK in May 2008. I was married in 2008 and my wife has US wages. What do I need to be filing? Thanks.

For 2008, you can only file as married filing jointly or married filing separately. You can file married filing jointly even if your spouse is nonresident.
On your return, you must report your worldwide income. On the joint return, both of you must report the worldwide income.
Your U.S. Tax Return: U.S. Citizen or Resident with Foreign Income (http://taxipay.blogspot.com/2008/03/us-citizen-or-resident-with-foreign.html)

You need to file a U.S. tax return including your worldwide income. If your spouse is also a U.S. citizen the same applies to her. If your spouse is not a U.S. citizen, we need more information about her U.S. visa status.

Note that while you may need to report your world-wide income, you may be able to exclude income earned in the U.K. using Form 2555.

And you may be able to claim foreign tax credits for U.K. taxes paid.
And you may have to file Form TD F 90-22.1
And.. .

For 2008, you can only file as married filing jointly or married filing separately. You can file married filing jointly even if your spouse is nonresident.
On your return, you must report your worldwide income. On the joint return, both of you must report the worldwide income.
Your U.S. Tax Return: U.S. Citizen or Resident with Foreign Income (http://taxipay.blogspot.com/2008/03/us-citizen-or-resident-with-foreign.html)

Thanks! That link really helped. Just to confirm I need to file Form 1040 or is there a specific form that I need to file. Also if one of the exclusion apply to me I might be able to file form 2555? Thanks.

Yes, Form 1040 plus Form 2555 if applicable.

However, it may be prudent if you consulted with a U.S. tax professional with some international tax experience.