The 10.10.1 OS X Yosemite update has been out for a few days now. I've been running with the updated system while working and am seeing improvements so far. Notably the bug that caused the computer name to change is fixed now. Notification centre remembers its settings after a restart and graphical performance of the system seems improved (no more jerky animations on dialogue boxes).
The update can be downloaded from here: http://support.apple.com/kb/DL1779
or directly via the Apps Store. More details are available here: http://support.apple.com/kb/HT6572
For a list of issues that I found in 10.10 see this post: http://www.igorkromin.net/index.php/2014/11/10/os-x-yosemite-1010-issues/
If your Mac's name keeps changing after you apply this update, make sure that you restart any AirPorts you may have on the network.
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