I'm always attracted to something that makes the offboard wiring more simple (less painful) and I may just be really really lazy, but I think these are just awesome!
LEDs are probably the part of offboard wiring I hate the most, because if I didn't include a current limiting resistor on the board you have to hang that somewhere offboard, and I really hate soldering wires to the LED pins. £3.50 for 50 and never have to solder an LED or even include a CLR again!! I may have to buy 1000.
http://www.ebay.co.uk/itm/261424418811