BBC bitesize has great resources to explain the internet ad technical terminology
Simon H has got some of the most comprehensive resources on his website and blog.
Amerian video tracking the path of packets of data
Phil Bagge has done some amazingly comprehensive work around the new computing curriculum......look here for long term, medium term and lesson ideas for all year groups
Brilliant site that traces any web site route....type in any website url to find all the steps it needs to travel to its destination
James May's youtube explanation of the Internet...more suitable for older children
Rather dry but comprehensive CPD website with pompous videos but useful pdfs on all aspects of the new computing curriculum