Rather than listing skills by job posting, why not have a place to list all of a person's skills, even if they are random like translating Greek, playing piano, or being an advanced web developer. Then you could find people with skills by locale, find and match random skills like someone who can compose a song in Greek and can do your website too.

Imagine an iphone interface where you could type in 'greek', 'piano', and 'web developer' and have the map program drop pins of people who match, along with their contact info.