Richard posted a link to Active History. It's an English site and costs about $80 for annual membership, but it's good value if only for the huge variety of activities for year 12 Modern History students(alas, no Ancient History!) and a bit of historiography for Exrension History. There is a lot of free stuff to whet your appetite. Games such as Fling the Teacher are great for some fun revision.
The History Faculty offers FREE video & audio lectures by leading UK historians. Please register for access to all our materials. There's no catch. We will not use your details for any commercial purpose.