Here are the home pages of two organisations which I have found helpful both in Britain and in the US, during my 27+ years with insulin-dependent diabetes.

This is the home page for the US Diabetes Association.

http://www.diabetes.org/home.jsp

and this is the home page for the UK's equivalent association - the British Diabetes Association (renamed not long ago as Diabetes UK).

http://www.diabetes.org.uk/home.htm