Why not merge reputation across SO, SF, and SU?
I am talking about surepuser, serverfault and stackoverflow altogether.
There are two reason for this opinion, one is philosophical and the other is practical. Let me start with the philosophical first.
www.google.com provides three different functionalities, yet, same person, log in once, and he's logged in to all of them.
In practice, many developers are ending up installing their software on server machines, many of them are required to maintain these bytes regularly or even build some other tools that will do this for automatically (serverfault.com) - That's why I see no reason having two separate accounts for the same
senior developers usually can be considered as power users, so why would it be a different for the very same developer when posting a question or answering one on suerpuser.com.
and most of all, having meta.stackoverflow on a separate account is totally mistaken - imagine a guy scoring 27k on stackoverflow. One day, this fellow has an idea how to improve the site so to make it even easier to answer questions.
If this fellow answered 12k questions a year, his suggestion must be considered differently that one who answered 3 question a year, right? Since he's a proven heavy user of the site and a major contributor. Yet, when he will first login to the meta.so and create the account one will not notice their stackoverflow activity and might ignore their feature request altogether.