I go onto the Australian Website, which you can get to through the www.bbc.co.uk/neighbours. if that is to far in advance then try digital spy as they put up to two weeks of episodes in their soaps catergory.
There is a site - www.ramsey-street.co.uk where you can find synopsis of every episode to date, including the ones that have not yet been screened in the UK. They are up to the end of season 2006 which is about 30 episodes in front of us.