it differs beacuse you could build boards in it:
category: UbbT v6, UbbT v5.5
boards in UbbT v6: Dev, Style, Design Integration
subBoards in UbbT v6>>Dev board: Mod suggiest, mod beta, mod completed
subBoards in UbbT v6>>Style Board: style suggiest, style beta, style completed
suboards in UbbT v6>>Design Integration :new scripts, suggestions.
In each subboards will go the new posts...it's a better way of organizing informations, specially if you have lots of boards...
I vote for this!
Luke01