I am going to india for H1B stamping and i have not filed by tax returns for year 2012, taken income tax returns extension.

This is a tax question, not an immigration question.

Can a illegal alien testify in a court of law

There is no new Obama law. Testifying in court does not depend on your status.

You will need to apply for a Florida's driver's license.

If I have a visitor/tourist visa, how long can I legally drive a motor vehicle in the US for?

You need to have either an international driver's license or a license from the state you are visiting.

Can this lady be deported? Is this fraud?

It sounds like fraud if she does not have a final divorce decree from the first marriage. Consult an immigration attorney.

Any tricks to get through Administrative Processing at Ottawa Consulate for H-1B Visa?

I agree with my colleagues. There are no tricks. You need to consult with your employer's immigration attorney.

K1 visa interview , travelled to USA in 2003 answering no to cimts having juvenile conviction and DUI conviction as adult

Yes arrests and convictions can have a negative impact in your K1 visa. Consult an immigration attorney right away.

If I have a visitor or tourist visa, how can I obtain a work permit through the government?

You are not allowed to work on b1-b2 visa.

Can an Indian Citizen on Canadian Work permit living in Canada, enter the US every weekend on a valid H4 visa?

Yes.

Reforms

Only Congress knows if something will pass. You have to be patient.