If you're in or around Seattle, please feel free to email me photos and/or a description of the plants you have available (and a list of plants you're willing to exchange).
I can post photos for you, link to your public Picasa or Flickr albums...whatever.
We also use Meetup.com to help facilitate exchanges through an events calendar and message board. Joining is free -- click here to become a member.
The group consists of gardeners of ALL levels of experience.