I picked up an iDangle case at CES from Fastcap that turned out to be very useful. It had a built-in lanyard made of a tough fabric that actually embedded a set of earbuds. A clever system allows those earbuds to be routed through the case into the iPhone's headphone jack. The earbuds don't have a microphone but I was able to place calls in a noisy CES show floor and I could hear and be heard just fine, using the phone's built-in microphone.
Made almost entirely in the USA (except the one inch headphone jack adapter) the case was very popular with all who saw me parading around the show with my iPhone safely hanging around my neck.
Fastcap also makes the iPole, an extendible arm with a tripod mount so you can film yourself using a camera or an iPhone if you use their iPole case. The offer two versions of the iPole. There is a walking stick version of the iPole, suitable for hiking that extends to 53" and the iPole mini that extends to 21".