I got this idea from our forum only, there was a post related to how-to-make.
So i gathered a few websites which are based on creativity, and which mainly contain how-to’s and many tutorials, but many of these should be paid.
1) http://www.makezine.com
2) http://www.howdesign.com
3) http://www.popsci.com
4) http://www.instructables.com
5) http://www.ehow.com
6) http://www.howstuffworks.com
If you have any more links, please share so that some people might get helped.
Updates :