If you don't know about this already, please take a look at the NFC Ring Kickstarter project. It's a ring with two NFC tags, one private, one public.
I've enabled my LastPass with the YubiKey NEO for the NFC tag, but that thing is just never near me when I need it, I always have to go digging through my pocket to use it. I eventually just get tired of that and have pretty much stopped using it.
But an NFC tag that's *always on your finger* and has a private/public key choice would really enable me to up my personal security.
Please support the NFC Ring.http://www.kickstarter.com/projects/mclear/nfc-ring