Emergency Information Card - helpful!
A related topic but a good reminder I hope! I always keep a cell phone with me, along with id and emergency contact information. The roads I ride on have good cell coverage and are heavily traveled by cyclists, but my main concern is getting injured and being unable to communicate.
Drugdigest.com has a great free emergency information card form, you can personalize it and it's credit card size. (I got mine off of webmd, but this one is similar.)
http://www.drugdigest.org/DD/SeniorC...373,IT,00.html
I keep one in my seat pack at all times (and my wallet too). I keep my DBF's phone numbers, my doctor's number, my blood type, date of last tetanus shot, and meds taken on it. Basically, the info I would want someone to have if they found me lying at the side of the road.
Hope this is helpful!