Some sites I recommomend

Aptana IDE

http://www.aptana.com/
A very good IDE that works in linux, windows.... for PHP, Ruby

BrowserShots

http://browsershots.org/
If you can wait for 5 mins, you will get a image print of how your webpage looks in different browsers in different OS.

Ruby Tutorial

http://www.math.umd.edu/~dcarrera/ruby/0.3/index.html
Simple way to learn core ruby... very easily readable and practical approach.

Firefox's World record page

http://www.spreadfirefox.com/en-US/worldrecord
Simple way to learn core ruby... very easily readable and practical approach.

PHP Classes

PHP Classes
PHP Classes - My favorite spot for PHP resources.