I expect the OP has wandered off, now he's seen three pages of varying Audax set-ups, but I can't resist joining in.
Bike: Genesis Day 06, Tiagra Triple - 52-42-30, with 11-28 cassette
Carradice Nelson Longflap, containing:
Multitool, chain splitter (even though I don't know how to use it), tyre levers, 2 spare inners, cable lock, lightweight rain jacket (Ron Hill, with integral hood), 2 x energy gels just in case, probably an apple and 2 x bananas, spare buff, wallet, car keys, routesheet as backup, Assos botty cream, several spare rechargeable batteries
Cateye Wireless Speedo
Garmin Etrex Vista Cx (when I don't leave it at home)
Shimano dyno hub driving B&M Cyo at front, and two Smart 0.5w flashing strobe rears (turned to steady in company)
25c Conti Gatorskin tyres, and curently a Mk1 Crudroad racer, because the Mk2 I am still trying to fettle onto the bike. No mudguard extensions. I feel like a pariah, sometimes.
Mobile phone in jersey pocket
Long frame pump attached below top tube
Tesco head torch attached to helmet for illuminating road signs at night
Oh, and polished black valve caps all round, of course.
Lycra Man