Books are my main source of everything, even though I can confidentally say that I take in about one word in 100. Should anyone be interested, for ADHD, I've found the following useful:
Barkley, R.A., Murphy, K.R. and Fischer, M. 2010. ADHD in Adults: what the science says. New York: Guildford Press. £18.95 from Foyles (www.foyles.co.uk). This book is a great tome written for professionals and interested public and about 500 pages so not for the fainthearted, but it is really useful for identifying all those symptoms and issues of adhd that specifically affect adults, and it is up to date with recent research.
Russell Barkley also has a useful and really ADHD-user-friendly: Taking Charge of Adult ADHD. New York: Guildford Press. £11.50 from Foyles.
More upbeat/positive, if less clinical/scientifically proven and quite old now, are Edward Hallowell and John Ratey's Driven to Distraction and Delivered from Distraction. Both paperbacks readily available/orderable. Also quite useful is: Kevin Murphy's Out of the Fog: treatment options and coping strategies for Adult Attention Deficit Disorder. Also paperback.