http://forebears.co.uk/ is an intriguing mix of links to data sources, distribution maps and meanings of a surname. It appears to be under development: a search on BIDGOOD shows what the impressive end product might look like, while the rest of our B__GOOD names were very incomplete. Well worth checking out especially if you have ancestors in the U.K. and Ireland. Results for other countries were very variable but hopefully will improve with time.
Forebears are worth a visit.