I have thought up hundreds of bike related product ideas during my lifetime, but not one of them has made it into production. I have to give it to those who actually make a go of getting a concept produced. Reader Gene came up with a novel valve cap hack, check it out -
I have lost a few valve caps in my day so I can relate. I had never heard of Quirky.com before, but I guess you vote for things to produce and Gene has his product featured for voting. If you give a thumps up to the idea, offer your vote of support.