Go to www.flixya.com. It’s a Video sharing website.
Register your account there and share at least 3 videos or PPT Presentations. Create blogs and share your articles from that blogs, also share some images and photos.
Then when you create your profile on this website you get a new form in the 2nd step, i.e. the google adsense registration form. Enter a valid email address to open a adsense account. I prefer gmail for better results.
After you sign up it gives you a publication Id and then after 2 days your account will be approved.
This is one of the tricks to get you google adsense approval in just 2 days.