Don't have a utility belt but I do have a "keyring", which contains in addition to home, office and car keys the following: Ironkey S200 Personal, 4GB. Enough for stuff which I need to carry around, the rest can be usually moved via internet or direct ethernet. SCM SCR3500 smart card reader, because for various reasons I prefer real smart cards over (probably more convenient in a keychain) USB tokens. And a card holder which contains credit cards, drivers license, id-card and a "blank" card with personal keys and certificates used for online authentication over HTTPS, VPN, SSH etc. So basically a digital extension of the traditional keychain (and no, they are not attached to a single big carabiner)