Hey this is an idea I have been working on for a while and have been using for quite some time while mountainbiking as a proving ground, I thought I would introduce it here.
I call them LugLox and they are designed to fit on zulu and nato type bands, my favorite bands and are designed to eliminate the dreaded lump on the lug ends.
Basically they slide on the band and hook over the pins, the design is such that when in place the pressure of the band keeps the LugLox at enough pressure that they will not inadvertantly unlatch from the pin. As soon as you release the pressure it allows the Luglox to either slide off the band or release the watch head for interchange, if you wear your band loose then these may not be for you.
I have been using them while mountainbiking which I feel is worse case scenerio, without any release problems.
They are made from stainless steel in a beadblast finish for now but as things develop certainly there will be other finsh options. I'm still working out production details and value any input.