January 2011: The site has undergone a major update to make its quizzes work across all the modern browsers. An improvement to many of the quiz pages is the option to turn feedback response sound on or off.
Inevitably with such a major update, some problems may have crept in. I'd be grateful if you could alert me to any you find. (Before doing so, you should make sure that you are viewing the up-to-date page by clearing the page cache. You do this by clicking Refresh or pressing F5.)
Please let me know also if you have any general comments or suggestions.