Warwick University counselling service have developed an A-Z of self-help information which encompasses a range of topics from Anxiety through to Writers block.
There are some also some useful internet forums for finding out about other people's experiences and sharing your own.
Caffeine Some information about the negative effects of caffeine
Procrastination research group has a wealth of cartoons to demonstrate the impact of procrastination as well as links to self assessment. The researcher Tim Pychyl also has a video lecture on procrastination.
Social Anxiety Uk have a population of university students that contribute to the discussion boards.