<div>Two recent Seforim which I found to be extremely informative with some groundbreaking Sevaros in issues of Pikuach Nefesh are:</div>
<div>1) Mishnas Pikuach Nefesh, by R' Yosef Aryeh Lorincz</div>
<div>2) B'chol Levavecha, by R' Yitzchak Isaac Weinberg</div>
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<div>The "Chashukei Chemed" series by R' Yitzchak Zilberstein, while not a very deep Sefer. has interesting analyses of practical cases which may set some Halachic precedents.</div>
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<div>Obviously the "Piskei Teshuvos" series</div>
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<div>"Halichos Shlomo" (Tefilla, Moadim) with the Pesakim of RSZA has become a major Halachic source.</div>
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<div>The "Tikkunim Umilluim" to Shemiras Shabbos K'Hilchasah (5753)</div>
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<div>I'm sure the Chevra will come up with some more.</div>