"Bright Spark Education is using Indian teachers trained in the UK curriculum to help British students aged 7 to 16" via Skype; "not looked upon favorably by at least one UK teacher"
A superb 'Must Try' HTML based collaborative whiteboard site. The tools are wonderfully simple. No log in required. Just share the page link to work collaboratively. Combine with a tool like Skype to share a lesson across classes, schools or even countries.
http://ictmagic.wikispaces.com/ICT+%26+Web+Tools