Hello, i am a green card holder since 12/15/05. I am planning to return the GC because i do not live in the US anymore.

You can surrender your green card and give up your residency whenever you want. As far as tax is concerned, you need to ask a tax attorney. Good luck.

Can the Judge delay my divorce as my wife is continuing to delay her COS application from H4 to F1 visa ?

This is a family law issue not an immigration one. Discuss this issue with your family law attorney.

Should I have a certified translation of stamps on my passport that are NOT in English for my naturalization interview?

If that's you're only proof and it's not in English, then yes, it needs to be translated.

Do I need to include an account transcript or return transcript with I 751?

I'm not sure I understand your question. If you have proof of a joint bank account you need to submit it with your application. And you also must...

I am green card holder.how long it takes time to come my husband in,usa after marrige????

About 2.5 years.

There is no deadline.

I came here under F1 visa. My name is as follows First name: FNU surname: XXX YYY ZZZ. My Visa, SSN, DL and I94 are the same

Yes, your name not matching the I-94 and visa will pose problems.

How long will it take for i601 waiver to approved and can u send application before leaving the us

I agree with my colleague.

H1B visa expired on 30th sep 2012. applied for extesnion - 22nd sep 2012. Yet to receive a decision , can i leave usa ?

I agree with my colleagues.

I started my h1b in oct 2006  and worked till sept 15 2011 and then left US for studies in Europe.

I agree with my colleagues.