Backyard gardening is hot, hot, hot right now, and everyone from novice gardeners to green-thumb pros are sharing more than tips online. The online forum GardenWeb is a great place to share ideas, tips and ask questions about gardening. But it's also a free forum to connect gardeners who have excess seeds with those who want them. Often, all you have to do is send a self-addressed stamped envelope to the gardener with seeds, and he'll ship you free seeds. Remember to share the wealth: If you have leftover seeds after planting, offer them up the next time you're surfing the web.