http://www.ictopus.org.uk/ - masses of lesson ideas and internet links for Primary Schools. A simple free registration gives access to a huge range.
A long list of useful sites on http://www.ikeepbookmarks.com/traffordiwb
http://www.britishcouncil.org/kids - with songs, stories etc
Money counting game from http://www.senteacher.org/ site, and others to play online