Ball Canning Book, and one of my favorite ways to use all kinds of tomatoes. It calls for plum, but I find any tomato will work, particularly if you opt to scoop out the seeds before you chop them.
Since both these tomatoes did so well, I definitely saved seeds. This will be the fourth year I've saved my Pink Brandywines, and the first for the Orange Banana. They were a great find in the Baker Creek Heirloom Seeds catalog, and a definite keeper! I've got two jars filled with tomato-seed goop, fermenting away. With any luck, they'll yield a whole lot of viable seed for next year's crop plus some to share.
A side note about saving tomato seeds: this works best from heirloom varieties, that breed true. You can save seeds from hybridized tomatoes, certainly, but the offspring (grown as next year's crop) may be nothing at all like the fruit you grew the summer before. You never know what you might get: something great, or something horrible. I opt to grow heirloom tomato varieties in my garden, but as gardening is a lifestyle of infinite variety, you could try to save some hybrid seeds and maybe even discover a new favorite!