BBC. OK, so it's not strictly to do with wargaming, but BBC radio - be it live or iPlayer is a regular accompaniment to my modelling, painting and even gaming activity. I also have the radio on when driving, in preferemce to CDs. My preferred stations are Radio 4, Radio 4 Extra and Radio 2. Radio - the world would be a far worse place without it.
B is also for.....Boxfiles. As has been said before, I have quite a few of these. They primarily contain my 20mm WW2 toys (like 10 Panzer Div below) but a modest number accomodate my 15mm Napoleonic and modern African toys.