i found some <a href="http://howhut.com/how-to-root-android-phone-or-tablet-easy-and-fast-methods/">easy and fast ways to root android phone</a>. And it worked with my Samsung and htc phones.
I think this article is more helpful for rooting. I root my and my friends phone using this method.
http://howhut.com/how-to-root-android-phone-or-tablet-easy-and-fast-methods/