X Tables:
http://www.topmarks.co.uk/maths-games/hit-the-button
Rainforest related sites:
http://www.rainforest-alliance.org/multimedia/jewels
General links
http://www.bbc.co.uk/bitesize/ks2/
Romans
http://www.bbc.co.uk/education/topics/zwmpfg8
World War Two
http://www.bbc.co.uk/schools/primaryhistory/world_war2/