OT Knowledge is for information on anything non bicycle-related which doesn't have its own board or sub-board.
The Pub is for general chatter.
Blinkenlights is now Ctrl-Alt-Del for computery things, Health & Fitness etc are self-explanatory.
A query about the best place to buy a washing machine would fit into OT Knowledge.
If OT Knowledge started getting really clogged with camping problems, for example, I might suggest to the admins we had a Tents and Camping board. As we don't want too many boards, a board would be sacrificed and merged with another.