I discovered http://www.damnlag.com/ yesterday and that i have no clue the way they have handled to construct that type of user register system using wordpress. how they have integrated the login form within the primary website and just how they have transformed the appearance and fields from the registration form.

Could it be some wordpress plugin i am unaware of? or they have screwed around using the wordpress code.

If anybody is aware of this please tell me.

Thank you for help, Thanks!

You will find a lot of actions/filters in wp-login.php. They most likely used just a mix of individuals plus some fancy CSS. For that login box around the top of the page, there's are template tags (under Login/Logout tags) that permit individuals to become baked into web site.