Meditation exercises

Does anyone have a very good and powerfull meditation technique. If you do I would appreciate it if you could share it with me either by u2u or via this post. Also I would appreciate it if people could share their way of opening the third eye. I already know the mantra so I am looking for another way of approaching this. Thanks in advance.
p.s.
I love meditating on this. The feeling you get in your forhead is insane!!!