Zaarly is new to me, but yes it seems similar. Probably the biggest difference between the two is that GigYard's service providers are individual people, not businesses.
I'm thinking that sharing it with existing communities that already engage in this way will be the easiest sell. My first target is my neighborhoods Facebook page that has something like 300+ user. Besides that there are a ton of folks attempting to do this type of work with Craigslist's service postings and I'm hoping a few considerate posts there might help.