I have recently found one resource to be of immense value. Unfortunately, I keep losing it. In my own work I keep finding prices and wages cited in various currencies. Since I have no idea of how much a scudo was worth in 1572 or what a livre tournois could purchase in 1604, I've decided to convert everything into more practical measures like eggs or liters of wine. To get there, I need some very hand data files:
Datafiles of historical prices and wages from the International Institute of Social History.