If you play at a .25/.50 NL game the blinds are .25 and .50. We define BB as big blind here, which is .50.
Poker Tracker defines my BB as twice the big blind for NL. So in .01/.02 NL the BB is .04. All my profit/loss statistics get reported in this way.

This link http://www.flopturnriver.com/phpBB2/...pic.php?t=2614 doesn't fully elaborate this notion for NL. Particularly the difference you are suggesting between the BB when betting and the BB when BB/100, BB/hour, etc. Perhaps it could be updated to clarify once and for all for NL?