These games are fun and not at all educational (well, perhaps they are a little bit). On the Raw Games menu, there are football and news reporter games, to name but two.
http://www.bbc.co.uk/raw/gamesandquizzes/
This algebra game, which contains year 7 work, requires a very big brain:
http://www.crickweb.co.uk/assets/resources/flash.php?&file=alg
Good luck!