I've been wanting to start a yeast library for some time now. At first there were grand visions of dozens of different yeast strains, all available in the freezer at a moment's notice. After spending a couple of weeks researching propagation and quality control techniques, I think I scared myself out of it. A few months passed, and I finally picked up where I left off. I realized I could step into this slowly, just like I did with homebrewing. I don't need a 400x oil immersion lens, a hemocytometer, or a -80˚C lab grade freezer yet-- just some vials, a pressure cooker, and fresh yeast (OK, and a few other things).