Here are some basic instructions for those wanting to save their own tomato seeds - it's not as hard as you might think!
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1. Start with your best fruit - nothing diseased or with blemishes. Encourage the traits you desire (early ripening, sweet taste, etc.)
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2. Cut the fruits and scoop the seeds into a bowl.
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3. Let stand for a few days at room temperature.
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4. It will then be a moldy mixture, but this is good, as the process removes the gelatinous covering on the seeds.
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5. Use a fine mesh strainer to rinse, leaving only the seeds.
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6. Leave to dry on wax paper (they will stick to paper towel), and remember to label if you're doing several varieties!
7. Store in a paper envelope for use next year.
This process will help develop plants that are specially suited to your garden conditions, resulting in healthier, happier plants!