I don’t play my guitars much these days, but the SpiderCapo from Creative Tunings makes me want to. Even if you aren’t a guitar player, you probably already know what a capo is and does. It presses across the strings on a guitar fretboard to change the pitch of the strings. The SpiderCapo is the only guitar capo that lets you capo each string individually allowing you to create all sorts of tunings and even play behind the capo. The SpiderCapo costs $29.95 and is also available in a mini version that works with Banjos and Ukuleles.