I joined a seed exchange from Garden Web this year. It's my first time doing anything like this, and I was pleasantly shocked by the package that arrived in the mail. The seed package gets mailed from one person to the next, with each person taking what they want and adding back an equal number of seeds. This package has been circulating amongst northern gardeners for a few years, and includes both purchased seed packets and saved seed from people's gardens.
This was the veggie and herb selection.
It was a fun experience, and I hope to join again next year. Now off to the post office to send the package on it's way to the next participant.