I like Joseph's landraces - both the concept and the delicious results I've gotten when I trade seeds with him. But I also like another term he uses: "promiscuously pollinated". It helps clear up a lot of the OP vs. OP confusion, and describes well the practice that many small-scale gardeners have of collecting seeds. I see it this way: let pollination happen in whatever way it will (insect, wind, etc.) and collect whatever seeds result.
In my small garden, I would often grow a small number of plants in total, but as many varieties as possible, and never had the space for proper isolation, so any seeds I saved ran the risk of being mutts (hybrids of undefined parentage). I appreciated the genetic diversity and avoided growing F1 hybrids in any case, so it wasn't a problem, but obviously this strategy is not for everyone.
