User Account Panel Sidebar Plugin

Just looking for a SIMPLE plugin for a user account panel. I’ve seen it on a couple of sites, but I can’t seem to find the plugin online anywhere! It just shows 2 links – “Register” and “Login.” Login directs to wp-login.php, and once logged in, the area with the “Register” and “Login” links says “welcome, user!” and the “Register” and “Login” links change to “Site Admin” and “Logout.” I found one that sort of does this, but it has entirely too much and I do not need everything it has: http://krikun.ru/wordpress/usersidebarpanel/#eng. I need something simple like this:

Shot 1: the user is logged out – http://i16.tinypic.com/3y6mvbk.gif
Shot 2: the user is logged in – http://i18.tinypic.com/2a0e3bl.gif

Thanks!!