Login/register sidebar?

How can I get this done?… I would like to have my register form and my login form in my Home page…. I know there are plugins that do this already but there is a problem. I would prefer if the register widget wasnt there when the user is already logged in… it makes sense if hes not logged but not afterwards….. maybe by adding some kind of widget logic??.. help please.

if its any of use, there are the plugins I have installed right now:
http://wordpress.org/extend/plugins/sidebar-login/
http://wordpress.org/extend/plugins/registration-form-widget/

If you think there is a better way of getting this done I dont have a problem with using a different plugin

Thanks in advance.