It is an user-powered site and social network with a focus on guides and tutorials in all categories like computing, technology, and the Internet. I could always use some tutorial or the other in my profession of teaching.
Mostly, I make it a point to bookmark such websites and use them during the course of my teaching. Who knows when something will come in handy?
Thank God I found out Tweako. In an article there under 'How to' category, I learnt how to use Windows Firewall in Windows Vista OS.
There are very useful links to hundreds of tutorials in various categories that include multimedia, graphics, security, programming and more.