This is a major part of historiography, with many resources mostly in English (and especially from the USA). A new blog is to be bookmarked, and further assessed : The Exchange, edited by the Business History Conference.
Further links promoted are :
– BEH On-Line
– BHC Web Links of Interest
– Enterprise & Society
– Hagley Museum and Library
– Baker Library Historical Collections
– EH.net, excellent resource bunch for Economic History including worth-to-read books reviews.
– Economics @WebOL.