W3C HTML validator
XML validator
Javascript validator web site virus checker

Manuals and references

w3schools HTML Reference
w3schools JavaScript and HTML DOM Reference
w3schools CSS Reference
PHP Manual
MySQL 5.0 Reference Manual
Google Maps JavaScript API v3
Facebook Like Button for web sites
Bash User Manual
Bash Beginners Guide
CYGWIN User Guide
Python 2.7 Language Reference

My DVD Collection

Rasbberry PI

GPIO Documents
RPIO Documents
Adding a Real Time Clock
Pi-Ezconnect diagram