I had an question transferred from Stack Overflow to Super User (because I did not even know that Super User existed). The question was answered quite well on Super User. When I came back and saw the transfer, and linked my account, I was surprised and pleased to see that the moved question was automatically linked to my account.
This isn't really a question. This is more a 'wow, great job'. This is one of the best designed websites I know with regards to proper handling of accounts, authentication, and user customization. Well done.