Gardeners: do you save seeds?

With my new garden this year, I went out of my way to get as many heirloom varieties as possible, and I intend to save seeds from them to plant next year. I know a lot of gardeners don’t, and just buy the hybrid seeds from the store each year. There’s a lot of reasons to plant heirloom varieties, one of which is seed saving ability, but also factors like flavor, productivity, disease and drought resistance, etc.

So in your garden, do you save seeds? Do you plant heirlooms?