IrfanView
A viewer program with simple editing capability, opens a large variety of image file formats, does batch conversion and even slideshows.

Animation Factory
Nice place to get them animated GIFs.

Harry The Cat
Another great place for them aGIFs.

Dimitry's Design Lab
Fanatastic reference for the aspiring designer in you.

Desktopian
Everything on your monitor.

Microsoft Developer Network
All the information you'll need on Microsoft's technologies.

Netscape Developer Center
You can find a very useful guide on JavaScript on this site.

Web Standards
Organisation fighting for browser comformity to web standards.

World Wide Web Consortium
The place to search for everything standard.