Useful websites
Chemguide
http://www.chemguide.co.uk/
If you are looking for quality revision notes

Doc Brown's Chemistry Clinic
http://www.wpbschoolhouse.btinternet.co.uk/page04/page04.htm
Notes and tests

Dr Rod Beavon's Chemistry Pages
http://www.rod.beavon.clara.net/chemistry_contents.htm

Notes and examination tips for the AS/A Level Chemistry.

Chemmy Bear
http://www.chemmybear.com/

Chemsoc Interactive Periodic Table
http://www.chemsoc.org/viselements/pages/pertable_fla.htm
Interactive Periodic Table of Elements

The Orbitron
http://www.shef.ac.uk/chemistry/orbitron/
3-D images of atomic orbitals and molecular orbitals.

The Organic Chemistry Review
http://www.organicchemistryreview.com/
Printable Notecards

S-cool! Revision Guide
http://www.s-cool.co.uk/topic_index.asp?subject_id=7&d=0
Extensive notes and sample questions.

RevisionNotes.co.uk
http://www.revision-notes.co.uk/A_Level/Chemistry/index.html
Revision notes

Beta-Theta.com Chemistry Section
http://www.beta-theta.com/Chemistry.html
Notes on topics relevant to AS/A Level Chemistry.

General Chemistry Online
http://antoine.frostburg.edu/chem/senese/101/index.shtml
Notes, articles, experiment simulations and tutorial for US students but relevant to A level students.