Over 800 maps going back 500 years. Quality could be dodgy though - to be honest I didn't check. I've got bookmarkitis. Quality of comments is deteriorating. Need sleep.
A collection of online maps provided by Yale University Library. It seems it might require a plug-in to view them. It seems they are in the process of digitising even further so the collection should grow.
An excellent site for maps of civilisations of all time periods and regions. Easily usable - great for student research or developing classroom resources. Just save the images and Bob's your uncle!
Just checked this site out for Medieval History maps. The site is only in Beta phase at the moment and only covers up to the end of Ancient History. i.e. 500AD
This site has some excellent maps, timelines, etc on a wide spread of historical periods. Might be useful for student research or classroom activities? It's quite comprehensive.
An excellent resource for teaching the history of the Indian Ocean Basin. It has some great flash-based maps where you can click on funky-looking icons and get some detailed historical information. Very Gen-Y friendly and there seemed to be some quality history in there.
The whole site too is based on a historiographic approach of understanding (and teaching) history as organised around oceans rather than continents or civilisations or periods. An interesting approach I think, especially for showing historical connections between otherwise distinct peoples.
Contains many useful tools and services for history teachers. There are online experts for tutoring and some good-quality sources. Looks like it's going to get even better.
An enormous collection of links covering a wide array of regions and all time periods. It has primary texts, maps, diagrams, statistics, all types of historical sources. Well-organised and searchable.