If you'd like to know a bit about medieval life in Europe, History on the Net has some information on life in medieval times, prepared as educational summaries for students. If you'd like to know more, Medieval Life And Times has a broader scope, and the surface links often have a number of subsequent links to even more information on sub-topics. If you want even more specifics, here is a list of medieval occupations, some information on buying, selling and bartering in medieval times, and a history of horses in Europe. [more inside]
Job Voyager: a data visualization tool for US occupations as a percentage of the labor pool, 1850-2000. (Stream graphs previously)
A List of Arcane Occupations If I had lived two hundred years ago, I might have been a PUREFINDER - someone who "went about the streets gathering dog droppings which were used for tanning leather."