Hello,
I got married in October 2007, but my wife is still living in my home country (She is not a US citizen). She has not been to the US throughout the whole of the year 2007 at all. I have been in the US on H1-B since 2005. Should I be filing my taxes for 2007 as "Single" or as "Married"? And if I file as Married, should I be filing as "Married filing separately" or "Married filing jointly"?
All advice is greatly appreciated.

Thanks!

You can file jointly with your wife and you both CHOSE to be treated as resident aliens. This will allow you to claim the $10,700 joint standard deduction plus two $3,400 personal exemption (for yourself and your wife).

The downside is that you must declare ALL 2007 world-wide income. There are two offsets available, by either claiming a Foreign Tax Credit (Form 1116) or a Foreign Income Exclusion (Form 2555).

Even with the downside, this is probably the best way for you to file.