Please find below some links to web resources that may be of interest to you.
Childnet Online Safety - Smartie the Penguin
NSPCC - Keeping Children Safe
NSPCC - PANTS Programme (Safety from Abuse)
Top Marks - Online Educational Resources
Internet Matters - E-Safety resources for children under 5
THINK! Road Safety Awareness Resources for children aged 3-6
Early Years Matters - The Importance of Play