where can i find a good tutorial to bypass http authentication.

hm... by pass not sure about that but i once used brute force. Which means you need to load up a word list of user names like for example.

user:pass

and run a lil proggie and some proxys to hit the website with botz trying to login.

You cannot bypass it. You have 3 choices. Brute force, Dictionary or packet analysis since its in plain text format.

Basically you can't mess around in a closet unless you get into a door or window by some method as described above.