graeme_p - 8:56 am on Jul 5, 2013 (gmt 0)
I know how you feel!
Content silos means arranging content around themes or categories: either in the navigation or URL structure.
In my case it was fairly easy: I already had a category structure so I just needed to make that primary and the alphabetic index of everything secondary.
A search on Start Page for "content silo" gave me a lot of links, including a fairly good how-to.