One of the most remarkable Google Apps to come along is Google Squared. When you put in a search term, say "genealogy programs" or something similar, Google Squared creates as spreadsheet like matrix of related search results. The search for genealogy programs produces a square with programs listed down the left and columns for image, description, price, system requirements, address and the option to add columns.
A search for "immigration lists" produces ships passenger lists, Germans to America and many, many other results.
Almost any general search term is going to produce a useful matrix with helpful information. This is definitely a tool worth knowing about.