Inclusion (NGFL catalogue of online resources - http://inclusion.ngfl.gov.uk
National Curriculum Online - http://www.nc.uk.net
National Literacy Strategy - http://www.standards.dfee.gov.uk/literacy
National Numeracy Strategy - http://www.standards.dfee.gov.uk/numeracy
DfES SEN - http://www.dfes.gov.uk/sen/ This is a new site from the DfES. This is probably the place to look for government documentation about SEN related issues.
The Standards Site - http://www.standards.dfee.gov.uk
Lifelong Learning - http://www.lifelonglearning.co.uk
The Basic Skills Agency - http://www.basic-skills.co.uk
Schemes of work - http://www.standards.dfee.gov.uk
Planning, teaching and assessing the curriculum for pupils with learning difficulties
The National Curriculum Online http://www.nc.uk.net/home.html