Hey guys,
I am trying to create a general db which can be used for general login purposes; a person will fill out a registration form and register for a site. Please have a look over my diagram and tell me what you think about it. Is it well built? Am I missing something? Did I use all the right relationships and data types, etc? I am trying to learn good database design, so please feel free to criticize.

A little background info:
Username is unique
All relationships are 1 to 1

Thanks
Reghardt

your relationships aren't 1 to 1

it all looks fine, assuming you really do intend to allow multiple users to have the same login, or one user to have muiltiple logins, or to allow a single user to have multiple positions, or the same user to belong to multiple companies

you have 3 "Link" tables -- remove the existing PKs (auto_increments?) and make the PK a composite key consisting of the other two columns

Wow I feel stupid.
Anyways I guess that is all apart of learning. I made some corrections so check it out now.

don't be so hard on yourself

that looks great, now, but i'm wondering why user and login are still separate (i wasn't sure what the key going in both directions means)