I came across this website about a seed-saving event in Toronto; hmm, if snowy climate places encourage seed swaps, why not us warmer climate folks?
There was a nice seed sharing booth at the Carolina Farm Stewardship's annual meeting last fall. We were invited to take samples of seeds (in small manila envelopes) to try -- what a great thing to offer up. I haven't saved seeds myself yet -- but it's an excellent thing to save open-pollinated varieties, many of which are 'pass-a-long' or heirloom varieties.
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It's traditional (and vital) in most of the world to do so.