(Going) The Extra Yad – Emily Garber is a Jewish genealogist whose thorough, nay, obsessive, research techniques have inspired me to dig deeper.
Lara’s Jewnealogy – Lara Diamond, another obsessive researcher (are you starting to see a pattern here?) is the preeminent expert on Jewish DNA, and her blog is a great resource for Eastern European research.
Odessa Secrets: The 1905 Pogrom – Started with a list of those killed in the 1905 Odessa pogrom, this blog expanded to cover the lives of those who were murdered, and explores the daily lives of Odessa Jews during this tumultuous period.
My Kerry Ancestors – Kay Caball is the go-to resource for anything genealogy-related in County Kerry, Ireland. Her blog gets deep in the weeds, which is a good thing.
Eastern European Mutt – Renée Carl is a Washington, DC-based genealogist who covers all sorts of topics (not just Eastern European ones) on her excellent blog.
Jewish genealogy resources:
Homestead Hebrews – An in-depth exploration of the once-flourishing Jewish community of Homestead, Pennsylvania.
Arolsen Archives – This site has a database of documents mostly relating to Holocaust victims and survivors, and they have even more in their on-site archives.