You probably arrive here at this site looking for the [tag]ezLOGIN[/tag] [tag]plugin[/tag]. There are in facts other alternatives out there worth trying.
There is another one called JPF Login/Logout plugin where you could customize the display text. The plugin page is here.
There is another one from krikun called User Sidebar Panel.
This one by James Kelly is called Themed Login Plugin, download is here. The login is directed to a page but when you are in you'll be in dashboard. This is not exactly I set out to do. In most cases I want click saver, i.e. save trips going in and out of admin dashboard.
To complete the story I couldn't miss the best and original sidebar login form hack by Homeland Stupidity.
Before you hit download and try mine you could try at the sidebar using ID/password = guest/guest.