EDIT

ICTtraining

The internet

bitesize

BBC bitesize has great resources to explain the internet ad technical terminology

simon haughton

Simon H has got some of the most comprehensive resources on his website and blog.

internet works

Amerian video tracking the path of packets of data

comp science

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

you

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

James May's youtube explanation of the Internet...more suitable for older children

quick

Rather dry but comprehensive CPD website with pompous videos but useful pdfs on all aspects of the new computing curriculum