I came to know about this Indian government scheme a few days ago. I wish I had known about this earlier. I could have made a few thousand contribution to it already.
Open at least a Tier I account which has all the tax benefits. Contribute at least Rs. 1,000 every year. Forgot about your contributions till you are age 60. (though there are some allowances for withdrawing partial amount before that)
If you can afford it, make voluntary contributions as much as you can. Your 60 year old version will thank your investment savvy ass.
Please google to know more about it. There are many detailed helpful articles out there.