For the current AS/A Level GCE specifications (for first teaching from September 2008) we have worked with a range of publishing partners - Hodder Education, Heinemann and Oxford University Press.
Each qualification has Official Publisher Partner and/or Approved Publication resources, endorsed by OCR for use with the specifications.
Hodder Education

Hodder Education publish resources for the following subjects: ICT and Computing, Business, Leisure and Recreation, Arts, Media and Life and Work and Health, Public Services and Care.
Heinemann

Heinemann publish resources for the following subjects: History and Social Sciences, Sciences and Functional Maths.
Oxford University Press

Oxford University Press publish resources for the following subjects: English, Modern Foreign Languages and Classics.