Touch your inner ring finger with your thumb.<p>That's the place to put it, and it could be sold as, you know... a ring, instead of a giant fake fingernail that makes it look like you had your thumb surgically replaced with a big toe.<p>What I'd really like to see is a novel mobile method of text entry. The first company to sell something that lets you efficiently type on the go without involving a tiny QWERTY keyboard is going to really make a difference in how we use tiny devices.<p>I've always wondered if it would be effective to try and determine virtual letter presses based on subtle "air typing" finger movements tracked with accelerometers or something. I might be willing to don goofy bluetooth fingernails for that kind of functionality...