The listing, 10 Organic heirloom tomato seeds, hard to find Italian variety, Pomodoro S. Marzano 2 has ended.
http://en.wikipedia.org/wiki/San_Marzano_tomato :
Compared to the Roma tomato, Marzano tomatoes are thinner and more pointed. The flesh is much thicker with fewer seeds, and the taste is stronger, sweeter and less acidic. Many people[who?] describe the taste as bittersweet. The San Marzano vines are indeterminate and have a somewhat longer season than other paste tomato varieties, making them particularly suitable for warmer climates. As is typical of heirloom plants, San Marzano is an open-pollinated variety that breeds true from generation to generation, making seed saving practical for the home gardener or farmer.