The Oxford Owl is a fantastic site for reading and phonics. It is well worth a visit. The website contains lots of advice for parents and there are a host of e-books available to read and most have some activity attached to them. Very user friendly site.
There are a variety of literacy games on the Pupils Zone page of this website which are both fun and educational.
Useful Maths Websites
Channel 4 – Puzzle Maths
Mathszone
Superkids Maths Worksheets
Mathsphere – Games and Puzzles