Some online sites that I find very interesting are:
http://www.pm.gov.uk/output/Page41.asp
Virtual tour of 10 Downing Street
http:www.youtube.com/theroyalchannel
The Queen’s YouTube channel
The Queen Mother’s Wedding 1923 (before I was born!)
http://www.youtube.comwatch?v=tnL6JkO1na
The Princes Trust
Also, for some hilarious ones which made me smile: Google Spike Milligan and look up some of his youtube entries. I particularly liked the one where is a German lady opera singer! He was my favourite Goon and sent me an autographed picture when I was 14 years old, responding to my first fan letter. The message read: Don’t forget to get undressed with the light on, I have my telescope trained on Liverpool!