By "armpit" lights, I mean the landing lights located where the leading edge of the wing meets the fuselage, and yes, all current Boeings have them, although the ones on the 747 are located a little further out on the wing.
I also believe that it is common knowledge that taxi lights are those located on the nosegear. They are usually illuminated during taxi at night or in low visibility conditions. Once the aircraft is positioned on the runway for takeoff, usually, all the landing lights are illuminated just before beginning the takeoff roll. I have however noticed aircraft on takeoff and landing with only taxi lights on, but that is not the norm.
In the case of 757's, there are two sets of lights on the nosegear-one for taxi, one for landing-. On Fokker 28's, 70's, and 100's there are no lights located on the nosegear, but there are two retractable spotlamps on the underside of the nose. In most pictures one lamp is on during taxi and two during to/L. On Canadair RJ
's there are no lights on the actual nosegear either but a set of double lights recessed into the underside of the nose.
I hope this clears things up...