One popular method of hacking is brute forcing !
Another method is to use fake yahoo/hotmail/gmail pages .
You can also use Trojan horses or remote keyloggers.
You can also hack one's account by social enginnering.
And the real method of hacking is to hack through sql, shells, hack using html, programming etc!

I have included an article about Social Engineering . Check it out

I will soon be uploading these stuff in my site too..

Keep checking and requesting
-Sanjiv
Allcomputertricks