This is a page listing various resources dealing with Ukrainian history, geography and related topics and subjects. Resources range from website and online article links to lists of recommended non-fiction bibliography.
Internet Encyclopedia of Ukraine - Probably the most complete online encyclopedia about the country available today.
Maps.hungaricana.hu - Fully scrollable, zoomable, searchable, in-depth historical maps of different territories of the Habsburg empire, Austria-Hungary and other parts of Europe. Layered viewing, based on maps from a particular era, is also readily available.
FEEFHS Map Room - 50 detailed maps of Germany, Austria-Hungary, Russia, the Balkans, and the Baltics from the 1882 Blackie and Sons atlas, all available at the site of the Federation of East European Family History Societies. The same site also includes a nice Genealogy Resource Directory.