Nicely don Dennis! a useful plugin, can I make one small feature request...
It appears that the user details are visible to unregistered users as well as logged in. Can you make an option to show the widget to ONLY registered users that are logged in? One way round this would be to make a function we can insert manually into theme sidebars and wrap it in a "if user logged in" conditional
There may be a privacy issue where registered users of a multi-author blog are not aware that their details show publically againsts their posts.
Thanks