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1. If i get canandian pr, can i travel to the US without any restrictions?
YES YOU CAN AS YOU ARE INDIAN CITIZEN AND INDIA IS COMMONWEATH COUNTRY
2. Do i need a special visa to work in the US?
YES YOU NEED WORK VISA TO WORK IN USA,H1B,LI, O, P, Depends on your qualification and sponser, But how you will maintain your Canadian PR if you want to remain out of canada for 183 days?
3. I have aged parents.. can i sponsor their PR if i get mine? And also for them how are their travel restrictions into the US?
YES YOU CAN SPONSER YOUR PARENTS AFTER WORKING/LIVING FOR ONE YEAR IN CANADA, AND YOU SHOULD HAVE SOME MINIMUM INCOME EARENDED IN CANADA TO SPONCER ANY BODY AFTER ONE YEAR(CANADA GOVT HAS SOME LIST FOR MINIMUM INCOME TO SPONSER)
YOUR PARENTS WHEN THEY BECOME PR OF CANADA CAN TRAVEL TO USA FREELY
4. Can i hold both canadian and US greencards? I heard that there is some law in the making which allows ( canadian law)
THERE IS NO such LAW canadian or US, SOME PERSONS ARE MISLEADING OTHERS WITH PREMATURE KNOWLEGE ABOUT IMMIGRATION,YOU CAN MAINTAIN BOTH FOR some time but you have to Abondon US GC or Canada PR at some time.