Last year I did some internet searches for tips on how to save your own tomato seeds. Not only did I bookmark a few links to help me on my way but I also actually tried it out. (I often just bookmark then forget.)
Here are a couple of the links I found helpful.
This Spring I popped some of my saved seeds in a pot and some of them are actually growing! Is this the ultimate form of recycling? Well, probably not but I'm enjoying the process. If they actually grow edible fruit I will be very pleased. I can't even remember what sort of tomatoes they were, (cherry I think.)