STAYING SAFE ONLINE

DirectGov's Staying Safe Online is a most excellent website, containing an abundance of invaluable information.
The site is specifically aimed at teenagers and covers a variety of topics, including: staying safe on social networking sites, the dangers of online chatrooms, meeting online friends, cyberbullying, file sharing and identity theft.

http://www.direct.gov.uk/en/YoungPeople/CrimeAndJustice/KeepingSafe/index.htm

Another equally excellent website is Get Safe Online.
The site is aimed at the adult population as a whole and covers pretty much every online eventuality you could possibly think of.

http://www.getsafeonline.org/