Luke Gedeon

The default position for the menu in WordPress 2.7 is on the left, but since the scroll-bar is on the right, some people wanted the menu over there too. Plus a lot of blogs/websites have menus on the right so menu on the right seems to be a pretty popular option.
This plug-in moves WordPress admin menu to the right side of the screen.

Admin Menu on Right

Moves WordPress admin menu to the right side of the screen.

severinh

Hide menu items in the admin interface from non-admin users. It’s still possible 
for them to access the corresponding pages by entering the URL directly.
This plug-in perfectly complements <code>Admin Trim Interface</code>, a plug-in capable of 
hiding other elements of the admin interface.
Please note that the administrator isn’t affected by the changes.

Trim Admin Menu

Hide menu items in the admin interface from non-admin users.

Admin Menu on Right vs Trim Admin Menu