In AccountRight, it is possible to change the user ID you are currently logging in with by selecting File » Switch Company File User, rather than having to exit out and then log back in again. Nice.
It is also a great feature when you have your user id linked to your my.MYOB account, but you need to log into AR with a different user profile.
However, it would be helpful to have the user ID that you are currently logged in with displayed so you know which profile you are using. Either on the Help » About window, or maybe on the status bar where it already gives your my.MYOB login such as: