Maplist : list of all multiplayer maps. minimaps. creeps, their level, and what kind of loot they drop. mines and how much gold they have. player starts. specials (such as mercenaries and fountains of health).
Strategies : build orders and strategies.
Replays : record of BB's pwnership
Map Editor : tutorials
BB Member Rankings : links to the player rankings pages on battle.net.
Links : strategy guides, good places for replays, that kinda thing.