AQA GCSE Computer Science 4512

http://www.aqa.org.uk/subjects/ict-and-computer-science/gcse/computer-science-4512

Awesome practical classroom activities

http://csunplugged.org/activities

Basic concepts of Computer Networks

http://www.slideshare.net/makyong1/basic-concepts-of-computer-networks

Powerpoint. Does what it says

Binary Game

http://forums.cisco.com/CertCom/game/binary_game_page.htm

Tetris with bytes.  Tests understanding of binary

Code Aacademy

http://www.codecademy.com/

Interactive coding lessons in a variety of languages

Examples of Computer Hardware

http://www.docstoc.com/docs/1565568/Examples-of-Computer-Hardware---DOC

Explanation, with annotated pictures of a dismantled PC

Flowcharting

http://www.breezetree.com/article-excel-flowchart-shapes.htm

Explanation, examples

Logic Gate Simulator

http://www.cs.kent.edu/~volkert/F10-10051/notes/logsim.html

Create truth tables and simple gate combinations

Magnetic Storage – how it works

http://www.youtube.com/watch?v=f3BNHhfTsvk

Magnetism: Data Storage

Runs Appinventor

http://beta.appinventor.mit.edu

Must have already been installed

SSD

http://www.youtube.com/watch?v=viac3j6MeII

Explaining Solid State Disks

Teach-ict

http://www.teach-ict.com/gcse_computing/gcse_computing_quizzes.htm

The site is mainly subscription but there is some good free stuff.  Here are graded quizzes.

yEd Graph Editor

http://www.yworks.com/en/products_yed_download.html

Free flowcharting software