What would work would depend on your status in the U.S.

Tourist Visa for parents ?? (Created a difficult situation by ignorance/stupidity)

Your parents should consult with an experienced immigration attorney before they fill out the forms and apply for their visitor visa.

How long more should i wait for n-400 citizenship decision ?

I agree with my colleagues.

Can I fix my husbands papers?

I agree with Charles. You should consult with an experienced immigration attorney to know your options.

What do I do if I forgot to turn in my I-94 upon leaving the US 12 years ago and now want to apply for a non immigrant Visa?

Hopefully you also have an entry stamp in your passport of the country you entered after your U.S. departure you support your claim.

Transfer of H1b visa from employer A to Employer B

If the company B is unable to file before 2/8/13, you should not port.

I am on Initial 12 months OPT and my Visa expires on Aug 2013. Can I go to India/ canada to extend my visa or it is risky?

You do not have to leave the country because your visa expires. Visa is a travel document. You need a valid visa to enter the U.S. As long as...

F1 to EAD ?

OPT is not recommended at this time as you already have unrestricted work authorization. No As long as the I-485 is pending, the EAD will be valid.

I am on H1B status with Indian citizenship. Need quick advice on Divorce Approach

This is not really an immigration question. Re-post on family law.

Apllying to H1B being married to a U.S citizen

H-1B applicant can have an immigrant and non immigrant intent and so the application will not run into a problem. However you may want to consider...