Using mod tools make this kind of list easier to make. Anyway, for February, here is the break-down of where questions were migrated away from ServerFault. I didn't go into any additional stats (mod-hammer vs. vote-to-5) or what happened when they got to the destination site since I'm on a crap network and that kind of loading may just kill it.

    Destination   | Count
    ------------------------
    StackOverflow | 14
    SuperUser     | 133
    Meta.SF       | 1
    WebMasters    | 40
    ------------------------
    Mod-moves to any site:
    ------------------------
    AskUbuntu     | 5
    Apple         | 3
    WordPress     | 2   
    Unix & Linux  | 8
    WebApps       | 2
    Security      | 1 

209 migrated questions, of which 63.6% went to SuperUser. What's interesting to see is that migrations to WebMasters outnumber migrations to StackOverflow. 

Moderators do have the ability to move questions to other sites, and 10% of 'em have been. If a question is a generic Linux question ([example][1]) that has to do with the inner workings of Linux and doesn't directly touch on sysadminly or end-usery things, mod-flag as a migrate to Unix & Linux. As you can see, we get a fair number of those. SuperUser-style questions regarding Ubuntu may be a better fit for AskUbuntu, although that question hasn't been fully resolved to my knowledge.


  [1]: http://unix.stackexchange.com/questions/9768/hows-a-module-approved-to-be-included-into-the-linux-kernel