Today I moved twelve boxes of books into my new office. Yay new office! As the newest prof, I get the smallest office, but it is more than adequate for my needs: lots of shelves, new desk, new computer, plenty of filing cabinets.
I'm pretty sure these books haven't all been on the shelves at the same time. My last few jobs ranged from "lots of shelf space" to "half a shelf in a shared office," so I've been storing various items for a while. Other books were shelved, piled, or boxed at home. Now I have to figure out how to organize them.
So, gentle readers--assuming you're still out there--what are your favorite methods of office organizing? By period? By author? By color? (Some friends once rearranged my shelves by color as a prank; the result was striking but a little surreal.) Primary sources separated, or mixed in?