Proximity sensors come in many shaper and forms. HoloTouch has technology for a hands-free holographic switch and Silicon Labs just introduced two infrared proximity sensors.

Many semiconductor companies tout their smart battery-charger ICs that adjust charging levels, monitor cut-off points, charge different types of cell chemistries, and so on.  Those capabilities help charge batteries efficiently, but often the "smarts" don't visibly help the user.

I began to use Molex connectors in the early '70's when I designed and built electronic equipment. The connectors and pins came in small blister packs sold at Scotty's Radio and TV in Blacksburg, VA, a short drive from my apartment. At one point I used so many Molex connectors I bought a complete kit that provided an assortment of connector types and a crimp tool. The kit disappeared long ago, probably lent and forgotten.

The folks at Waldom Electronics worked with Molex to create a new line of Molex Kits, such as those shown in the photos here.