I've put together a major 'cheat sheet' for my own reference, but the file is huge - open at your own risk.
So, for your viewing pleasure, here's a slightly more geriatric-laptop-friendly version.
Basements and the like, not so much. The soil in my village has a hard enough time tolerating the foundations of above-ground buildings, so underground architecture is more-or-less out of the question. What I love about cellars is the sheer variety, from wine cellars to root cellars to data centres to places-where-people-put-their-stuff-to-forget-about-it. I'm not sure whether we want to go down the private shelter route or whether we want the shelter to be huge, as though it was a public building, so I'm keeping my options open.
Last but not least, there's this very informative bunker study by Michael Janzen. The accompanying article is excellent as well. It discusses the basic principles of nuclear-survival architecture, such as the importance of 90-degree turns in ventilation systems to keep irradiated particles from entering the bunker, and various building materials and the amount of them needed to block radiation.